Thermal Mechanical Specifications and Design Guidelines (TMSDG)
Supporting the Intel® Core™ i7, i5 and i3 Desktop Processor
January 2011
®
Document Number #: 324644-002
INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED,
BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS
PROVIDED IN INTEL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER,
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LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY
PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel products are not intended for use in medical, life saving, or
life sustaining applications.
Intel may make changes to specifications and product descriptions at any time, without notice.
Designers must not rely on the absence or characteristics of any features or instructions marked “reserved” or “undefined.” Intel
reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future
changes to them.
The processor and Intel Series 6 Chipset and LGA1155 socket may contain design defects or errors known as errata which may
cause the product to deviate from published specifications. Current characterized errata are available on request.
“Intel® Turbo Boost Technology requires a PC with a processor with Intel Turbo Boost Technology capability. Intel Turbo Boost
Technology performance varies depending on hardware, software and overall system configuration. Check with your PC
manufacturer on whether your system delivers Intel Turbo Boost Technology.For more information, see
http://www.intel.com/technology/turboboost.”
Enhanced Intel
Intel processor numbers are not a measure of performance. Processor numbers differentiate features within each processor family,
not across different processor families. See www.intel.com/products/processor_number for details.
®
SpeedStep® Technology See the Processor Spec Finder or contact your Intel representative for more information.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Intel, Intel Core, Pentium, and the Intel logo are trademarks of Intel Corporation in the U.S and other countries.
* Other brands and names may be claimed as the property of others.
10-1 Use Conditions (Board Level) ................................................................................... 89
11-1 Fan Heatsink Power and Signal Specifications............................................................. 97
11-2 Fan Heatsink Power and Signal Specifications........................................................... 101
®
Core™ i7-2000 and i5-2000 Desktop
®
Core™ i7-2000 and i5-2000 Desktop
®
Core™ i3-2000 Desktop Processor Series
®
Core™ i5-2000 Desktop Processor
®
Core™ i5-2000 and i3-2000 Desktop
®
Core™ i7-2000 and
®
Core™ i7-2000 and
®
Core™ i3-2000
®
Core™ i5-2000
®
Core™ i5-2000 and
Thermal/Mechanical Specifications and Design Guidelines7
Revision History
Revision
Number
001• Initial releaseJanuary 2011
002• Minor edits for clarityJanuary 2011
DescriptionRevision Date
§
8Thermal/Mechanical Specifications and Design Guidelines
Introduction
1Introduction
The goal of this document is to provide thermal and mechanical specifications for the
processor and the associated socket. The usual design guidance is also included.
The components described in this document include:
• The thermal and mechanical specifications for the following Intel® desktop
processors:
—Intel® Core™ i7-2000 desktop processor series
®
—Intel
—Intel
• The LGA1155 socket and the Independent Loading Mechanism (ILM) and back
plate.
• The reference design thermal solution (heatsink) for the processors and associated
retention hardware.
The Intel
different thermal specifications. When required for clarity, this document will use:
—Intel® Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W)
—Intel
—Intel
—Intel
—Intel
Core™ i5-2000 desktop processor series
®
Core™ i3-2000 desktop processor series
®
Core™ i7-2000, i5-2000 and i3-2000 desktop processor series has the
®
Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 65W)
®
Core™ i3-2000 desktop processor series (Dual Core 65W)
®
Core™ i5-2000 desktop processor series (Quad Core 45W)
®
Core™ i5-2000 and i3-2000 desktop processor series (Dual Core 35W)
Note:When the information is applicable to all products the this document will use
“processor” or “processors” to simplify the document.
Thermal/Mechanical Specifications and Design Guidelines9
1.1References
Material and concepts available in the following documents may be beneficial when
reading this document.
BypassBypass is the area between a passive heatsink and any object that can act to form a duct. For this
CTECoefficient of Thermal Expansion. The relative rate a material expands during a thermal event.
DTSDigital Thermal Sensor reports a relative die temperature as an offset from TCC activation temperature.
FSCFan Speed Control
IHSIntegrated Heat Spreader: a component of the processor package used to enhance the thermal
ILMIndependent Loading Mechanism provides the force needed to seat the 1155-LGA land package onto the
PCHPlatform Controller Hub. The PCH is connected to the processor via the Direct Media Interface (DMI) and
LGA1155 socketThe processor mates with the system board through this surface mount, 1155-land socket.
PECIThe Platform Environment Control Interface (PECI) is a one-wire interface that provides a communication
CA
CS
SA
T
CASE or TC
T
CASE_MAX
TCCThermal Control Circuit: Thermal monitor uses the TCC to reduce the die temperature by using clock
example, it can be expressed as a dimension away from the outside dimension of the fins to the nearest
surface.
performance of the package. Component thermal solutions interface with the processor at the IHS surface.
socket contacts.
Intel® Flexible Display Interface (Intel® FDI).
channel between Intel processor and chipset components to external monitoring devices.
Case-to-ambient thermal characterization parameter (psi). A measure of thermal solution performance
using total package power. Defined as (T
be specified for measurements.
Case-to-sink thermal characterization parameter. A measure of thermal interface material performance
using total package power. Defined as (T
Sink-to-ambient thermal characterization parameter. A measure of heatsink thermal performance using
total package power. Defined as (T
The case temperature of the processor, measured at the geometric center of the topside of the TTV IHS.
The maximum case temperature as specified in a component specification.
modulation and/or operating frequency and input voltage adjustment when the die temperature is very
near its operating limits.
– TLA) / Total Package Power.
S
– TLA) / Total Package Power. The heat source should always
CASE
– TS) / Total Package Power.
CASE
10Thermal/Mechanical Specifications and Design Guidelines
Introduction
Table 1-2.Terms and Descriptions (Continued)
TermDescription
T
CONTROL
TDPThermal Design Power: Thermal solution should be designed to dissipate this target power level. TDP is not
Thermal MonitorA power reduction feature designed to decrease temperature after the processor has reached its maximum
Thermal ProfileLine that defines case temperature specification of the TTV at a given power level.
TIMThermal Interface Material: The thermally conductive compound between the heatsink and the processor
TTVThermal Test Vehicle. A mechanically equivalent package that contains a resistive heater in the die to
T
LA
T
SA
Tcontrol is a static value that is below the TCC activation temperature and used as a trigger point for fan
speed control. When DTS > Tcontrol, the processor must comply to the TTV thermal profile.
the maximum power that the processor can dissipate.
operating temperature.
case. This material fills the air gaps and voids, and enhances the transfer of the heat from the processor
case to the heatsink.
evaluate thermal solutions.
The measured ambient temperature locally surrounding the processor. The ambient temperature should be
measured just upstream of a passive heatsink or at the fan inlet for an active heatsink.
The system ambient air temperature external to a system chassis. This temperature is usually measured
at the chassis air inlets.
§
Thermal/Mechanical Specifications and Design Guidelines11
Introduction
12Thermal/Mechanical Specifications and Design Guidelines
Package Mechanical & Storage Specifications
IHS
Substrate
System Board
Capacitors
Core (die)
TIM
LGA1155 Socket
2Package Mechanical & Storage
Specifications
2.1Package Mechanical Specifications
The processor is packaged in a Flip-Chip Land Grid Array package that interfaces with
the motherboard via the LGA1155 socket. The package consists of a processor
mounted on a substrate land-carrier. An integrated heat spreader (IHS) is attached to
the package substrate and core and serves as the mating surface for processor thermal
solutions, such as a heatsink. Figure 2-1 shows a sketch of the processor package
components and how they are assembled together. Refer to Chapter 3 and Chapter 4
for complete details on the LGA1155 socket.
The package components shown in Figure 2-1 include the following:
1. Integrated Heat Spreader (IHS)
2. Thermal Interface Material (TIM)
3. Processor core (die)
4. Package substrate
5. Capacitors
Figure 2-1. Processor Package Assembly Sketch
Note:
1.Socket and motherboard are included for reference and are not part of processor package.
2.For clarity the ILM not shown.
Thermal/Mechanical Specifications and Design Guidelines13
2.1.1Package Mechanical Drawing
37.5
37.5
Figure 2-2 shows the basic package layout and dimensions. The detailed package
mechanical drawings are in Appendix D. The drawings include dimensions necessary to
design a thermal solution for the processor. These dimensions include:
1. Package reference with tolerances (total height, length, width, and so on)
2. IHS parallelism and tilt
3. Land dimensions
4. Top-side and back-side component keep-out dimensions
5. Reference datums
6. All drawing dimensions are in mm.
Figure 2-2. Package View
Package Mechanical & Storage Specifications
2.1.2Processor Component Keep-Out Zones
The processor may contain components on the substrate that define component keepout zone requirements. A thermal and mechanical solution design must not intrude into
the required keep-out zones. Decoupling capacitors are typically mounted to either the
topside or land-side of the package substrate. See Figure B-3 and Figure B-4 for keepout zones. The location and quantity of package capacitors may change due to
manufacturing efficiencies but will remain within the component keep-in. This keep-in
zone includes solder paste and is a post reflow maximum height for the components.
14Thermal/Mechanical Specifications and Design Guidelines
Package Mechanical & Storage Specifications
2.1.3Package Loading Specifications
Ta b le 2 - 1 provides dynamic and static load specifications for the processor package.
These mechanical maximum load limits should not be exceeded during heatsink
assembly, shipping conditions, or standard use condition. Also, any mechanical system
or component testing should not exceed the maximum limits. The processor package
substrate should not be used as a mechanical reference or load-bearing surface for
.
Table 2-1.Processor Loading Specifications
thermal and mechanical solution.
ParameterMinimumMaximumNotes
Static Compressive Load-600 N [135 lbf]1, 2, 3
Dynamic Compressive Load-712 N [160 lbf ] 1, 3, 4
Notes:
1.These specifications apply to uniform compressive loading in a direction normal to the processor IHS.
2.This is the maximum static force that can be applied by the heatsink and retention solution to maintain the
heatsink and processor interface.
3.These specifications are based on limited testing for design characterization. Loading limits are for the
package only and do not include the limits of the processor socket.
4.Dynamic loading is defined as an 50g shock load, 2X Dynamic Acceleration Factor with a 500g maximum
thermal solution.
2.1.4Package Handling Guidelines
Ta b le 2 - 2 includes a list of guidelines on package handling in terms of recommended
maximum loading on the processor IHS relative to a fixed substrate. These package
handling loads may be experienced during heatsink removal.
Table 2-2.Package Handling Guidelines
ParameterMaximum RecommendedNotes
Shear311 N [70 lbf]1, 4
Tensile111 N [25 lbf]2, 4
Torque3.95 N-m [35 lbf-in]3, 4
Notes:
1.A shear load is defined as a load applied to the IHS in a direction parallel to the IHS top surface.
2.A tensile load is defined as a pulling load applied to the IHS in a direction normal to the IHS surface.
3.A torque load is defined as a twisting load applied to the IHS in an axis of rotation normal to the IHS top
surface.
4.These guidelines are based on limited testing for design characterization.
2.1.5Package Insertion Specifications
The processor can be inserted into and removed from an LGA1155 socket 15 times. The
socket should meet the LGA1155 socket requirements detailed in Chapter 5.
2.1.6Processor Mass Specification
The typical mass of the processor is 21.5g (0.76 oz). This mass [weight] includes all
the components that are included in the package.
Thermal/Mechanical Specifications and Design Guidelines15
2.1.7Processor Materials
Sample (QDF):
GRP1LINE1: i{M}{C}YY
GRP1LINE2: INTEL CONFIDENTIAL
GRP1LINE3: QDF ES SPEED
GRP1LINE4: COUNTRY OF ORIGIN
GRP1LINE5: {FPO} {e4}
Production (SSPEC):
GRP1LINE1: i{M}{C}YY
GRP1LINE2: BRAND PROC#
GRP1LINE3: SSPEC SPEED
GRP1LINE4: COUNTRY OF ORIGIN
GRP1LINE5: {FPO} {e4}
Package Mechanical & Storage Specifications
Tab l e 2- 3 lists some of the package components and associated materials.
Figure 2-3 shows the topside markings on the processor. This diagram is to aid in the
identification of the processor.
Figure 2-3. Processor Top-Side Markings
GRP1LINE1
GRP1LINE2
GRP1LINE3
GRP1LINE4
GRP1LINE5
S/N
16Thermal/Mechanical Specifications and Design Guidelines
Package Mechanical & Storage Specifications
AY
AV
AT
AP
AM
AK
AH
AF
AD
AB
Y
V
T
P
M
K
H
F
D
B
AW
AU
AR
AN
AL
AJ
AG
AE
AC
AA
W
U
N
R
K
J
G
E
C
A
1357911 13 15 17 19 21 2325 27 29 31
33 35 37 39
2 4 6 8 101214 1618202224 26283032
34 36 38 40
2.1.9Processor Land Coordinates
.
Figure 2-4. Processor Package Lands Coordinates
Thermal/Mechanical Specifications and Design Guidelines17
Figure 2-4 shows the bottom view of the processor package.
Package Mechanical & Storage Specifications
2.2Processor Storage Specifications
Tab l e 2- 4 includes a list of the specifications for device storage in terms of maximum
and minimum temperatures and relative humidity. These conditions should not be
.
Table 2-4.Storage Conditions
exceeded in storage or transportation.
Parameter DescriptionMinMaxNotes
T
ABSOLUTESTORAGE
T
SUSTAINEDSTORAGE
RH
SUSTAINEDSTORAGE
TIME
SUSTAINEDSTORAGE
Notes:
1.Refers to a component device that is not assembled in a board or socket that is not to be electrically
connected to a voltage reference or I/O signals.
2.Specified temperatures are based on data collected. Exceptions for surface mount reflow are specified in by
applicable JEDEC standard Non-adherence may affect processor reliability.
3.T
ABSOLUTESTORAGE
moisture barrier bags or desiccant.
4.Intel branded board products are certified to meet the following temperature and humidity limits that are
given as an example only (Non-Operating Temperature Limit: -40 °C to 70 °C, Humidity: 50% to 90%,
non-condensing with a maximum wet bulb of 28 °C). Post board attach storage temperature limits are not
specified for non-Intel branded boards.
5.The JEDEC, J-JSTD-020 moisture level rating and associated handling practices apply to all moisture
sensitive devices removed from the moisture barrier bag.
6.Nominal temperature and humidity conditions and durations are given and tested within the constraints
imposed by T
The non-operating device storage temperature.
Damage (latent or otherwise) may occur when
subjected to for any length of time.
The ambient storage temperature limit (in
shipping media) for a sustained period of time.
The maximum device storage relative humidity
for a sustained period of time.
A prolonged or extended period of time; typically
associated with customer shelf life.
applies to the unassembled component only and does not apply to the shipping media,
SUSTAINED STORAGE
and customer shelf life in applicable intel box and bags.
-55 °C125 °C1, 2, 3
-5 °C40 °C4, 5
60% @ 24 °C5, 6
0
Months6 Months
6
§
18Thermal/Mechanical Specifications and Design Guidelines
LGA1155 Socket
3LGA1155 Socket
This chapter describes a surface mount, LGA (Land Grid Array) socket intended for the
processors. The socket provides I/O, power and ground contacts. The socket contains
1155 contacts arrayed about a cavity in the center of the socket with lead-free solder
balls for surface mounting on the motherboard.
The contacts are arranged in two opposing L-shaped patterns within the grid array. The
grid array is 40 x 40 with 24 x 16 grid depopulation in the center of the array and
selective depopulation elsewhere.
The socket must be compatible with the package (processor) and the Independent
Loading Mechanism (ILM). The ILM design includes a back plate which is integral to
having a uniform load on the socket solder joints. Socket loading specifications are
listed in Chapter 5.
Figure 3-1. LGA1155 Socket with Pick and Place Cover
Thermal/Mechanical Specifications and Design Guidelines19
Figure 3-2. LGA1155 Socket Contact Numbering (Top View of Socket)
A C E G J L N R U W AA AC AE AG AJ AL AN AR AU AW
B D F H K M P T V Y AB AD AF AH AK AM AP AT AV AY
1
3
7
5
9
11
15
13
17
19
23
21
25
27
29
2
8
4
6
10
16
12
14
18
24
20
22
26
28
30
15
11
13
17
23
19
21
25
31
27
29
33
39
35
37
32
14
12
16
18
22
20
24
26
30
28
34
38
36
40
LGA1155 Socket
3.1Board Layout
The land pattern for the LGA1155 socket is 36 mils X 36 mils (X by Y) within each of the
two L-shaped sections. Note that there is no round-off (conversion) error between
20Thermal/Mechanical Specifications and Design Guidelines
socket pitch (0.9144 mm) and board pitch (36 mil) as these values are equivalent. The
two L-sections are offset by 0.9144 mm (36 mil) in the x direction and 3.114 mm
(122.6 mil) in the y direction, see Figure 3-3. This was to achieve a common package
land to PCB land offset which ensures a single PCB layout for socket designs from the
multiple vendors.
LGA1155 Socket
A C E GJL NR U W AA AC AE AG AJ AL AN AR AU AW
B D FH K M PTV Y AB AD AF AH AK AM AP AT AV AY
1
3
7
5
9
11
15
13
17
19
23
21
25
27
29
2
8
4
6
10
16
12
14
18
24
20
22
26
28
30
32
15
11
14
12
13
16
17
23
19
18
22
20
21
24
25
31
27
26
30
28
29
33
39
35
34
38
36
37
40
B D F HK M PTV Y AB AD AF AH AK AM AP AT AV AY
A C EG JL NR U W AA AC AE AG AJ AL AN AR AU AW
122.6 mi l (3.1 144mm )
36mil (0.9144 mm )
Figure 3-3. LGA1155 Socket Land Pattern (Top View of Board)
Thermal/Mechanical Specifications and Design Guidelines21
LGA1155 Socket
Load plate
Frame
Load Lever
BackPlate
Shoulder
Screw
Load plate
Frame
Load Lever
Back Plate
Shoulder
Screw
3.1.1Suggested Silkscreen Marking for Socket Identification
Intel is recommending that customers mark the socket name approximately where
shown in Figure 3-4.
Figure 3-4. Suggested Board Marking
3.2Attachment to Motherboard
The socket is attached to the motherboard by 1155 solder balls. There are no additional
external methods (that is, screw, extra solder, adhesive, and so on) to attach the
socket.
As indicated in Figure 3-1, the Independent Loading Mechanism (ILM) is not present
during the attach (reflow) process.
Figure 3-5. Attachment to Motherboard
22Thermal/Mechanical Specifications and Design Guidelines
LGA1155 Socket
3.3Socket Components
The socket has two main components, the socket body and Pick and Place (PnP) cover,
and is delivered as a single integral assembly. Refer to Appendix C for detailed
drawings.
3.3.1Socket Body Housing
The housing material is thermoplastic or equivalent with UL 94 V-0 flame rating capable
of withstanding 260 °C for 40 seconds which is compatible with typical reflow/rework
profiles. The socket coefficient of thermal expansion (in the XY plane), and creep
properties, must be such that the integrity of the socket is maintained for the
conditions listed in Chapter 5.
The color of the housing will be dark as compared to the solder balls to provide the
contrast needed for pick and place vision systems.
3.3.2Solder Balls
A total of 1155 solder balls corresponding to the contacts are on the bottom of the
socket for surface mounting with the motherboard. The socket solder ball has the
following characteristics:
• Lead free SAC (SnAgCu) 305 solder alloy with a silver (Ag) content between 3%
and 4% and a melting temperature of approximately 217 °C. The alloy is
compatible with immersion silver (ImAg) and Organic Solderability Protectant
(OSP) motherboard surface finishes and a SAC alloy solder paste.
• Solder ball diameter 0.6 mm ± 0.02 mm, before attaching to the socket lead.
The co-planarity (profile) and true position requirements are defined in Appendix C.
3.3.3Contacts
Base material for the contacts is high strength copper alloy.
For the area on socket contacts where processor lands will mate, there is a 0.381 m
[15 inches] minimum gold plating over 1.27 m [50 inches] minimum nickel
underplate.
No contamination by solder in the contact area is allowed during solder reflow.
3.3.4Pick and Place Cover
The cover provides a planar surface for vacuum pick up used to place components in
the Surface Mount Technology (SMT) manufacturing line. The cover remains on the
socket during reflow to help prevent contamination during reflow. The cover can
withstand 260 °C for 40 seconds (typical reflow/rework profile) and the conditions
listed in Chapter 5 without degrading.
As indicated in Figure 3-6, the cover remains on the socket during ILM installation, and
should remain on whenever possible to help prevent damage to the socket contacts.
Thermal/Mechanical Specifications and Design Guidelines23
Cover retention must be sufficient to support the socket weight during lifting,
Pick & Place Cover
Pin 1
ILM Installation
Pick & Place Cover
Pin 1
ILM Installation
translation, and placement (board manufacturing), and during board and system
shipping and handling. PnP Cover should only be removed with tools, to prevent the
cover from falling into the contacts.
The socket vendors have a common interface on the socket body where the PnP cover
attaches to the socket body. This should allow the PnP covers to be compatible between
socket suppliers.
As indicated in Figure 3-6, a Pin1 indicator on the cover provides a visual reference for
proper orientation with the socket.
Figure 3-6. Pick and Place Cover
LGA1155 Socket
3.4Package Installation / Removal
24Thermal/Mechanical Specifications and Design Guidelines
As indicated in Figure 3-7, access is provided to facilitate manual installation and
removal of the package.
To assist in package orientation and alignment with the socket:
• The package Pin1 triangle and the socket Pin1 chamfer provide visual reference for
proper orientation.
• The package substrate has orientation notches along two opposing edges of the
package, offset from the centerline. The socket has two corresponding orientation
posts to physically prevent mis-orientation of the package. These orientation
features also provide initial rough alignment of package to socket.
• The socket has alignment walls at the four corners to provide final alignment of the
package.
LGA1155 Socket
Pin 1
Chamfer
Package
Pin 1
Indicator
Alignment
Post
(2 Places)
Finger/Tool
Access
(2 Pla ces)
Orientation
Notch
(2 Place s)
.
Figure 3-7. Package Installation / Removal Features
3.4.1Socket Standoffs and Package Seating Plane
Standoffs on the bottom of the socket base establish the minimum socket height after
solder reflow and are specified in Appendix C.
Similarly, a seating plane on the topside of the socket establishes the minimum
package height. See Section 5.2 for the calculated IHS height above the motherboard.
3.5Durability
The socket must withstand 20 cycles of processor insertion and removal. The max
chain contact resistance from Tab l e 5 - 4 must be met when mated in the 1st and 20th
cycles.
The socket Pick and Place cover must withstand 15 cycles of insertion and removal.
3.6Markings
There are three markings on the socket:
• LGA1155: Font type is Helvetica Bold - minimum 6 point (2.125 mm). This mark
will also appear on the pick and place cap.
• Manufacturer's insignia (font size at supplier's discretion).
• Lot identification code (allows traceability of manufacturing date and location).
Thermal/Mechanical Specifications and Design Guidelines25
All markings must withstand 260 °C for 40 seconds (typical reflow/rework profile)
without degrading, and must be visible after the socket is mounted on the
motherboard.
LGA1155 and the manufacturer's insignia are molded or laser marked on the side wall.
3.7Component Insertion Forces
Any actuation must meet or exceed SEMI S8-95 Safety Guidelines for Ergonomics/
Human Factors Engineering of Semiconductor Manufacturing Equipment, example Table
R2-7 (Maximum Grip Forces). The socket must be designed so that it requires no force
to insert the package into the socket.
3.8Socket Size
Socket information needed for motherboard design is given in Appendix C.
This information should be used in conjunction with the reference motherboard keepout drawings provided in Appendix B to ensure compatibility with the reference thermal
mechanical components.
LGA1155 Socket
§
26Thermal/Mechanical Specifications and Design Guidelines
Independent Loading Mechanism (ILM)
4Independent Loading
Mechanism (ILM)
The ILM has two critical functions: deliver the force to seat the processor onto the
socket contacts and distribute the resulting compressive load evenly through the socket
solder joints.
The mechanical design of the ILM is integral to the overall functionality of the LGA1155
socket. Intel performs detailed studies on integration of processor package, socket and
ILM as a system. These studies directly impact the design of the ILM. The Intel
reference ILM will be “build to print” from Intel controlled drawings. Intel recommends
using the Intel Reference ILM. Custom non-Intel ILM designs do not benefit from Intel's
detailed studies and may not incorporate critical design parameters.
Note:There is a single ILM design for the LGA1155 socket and LGA1156 socket.
4.1Design Concept
The ILM consists of two assemblies that will be procured as a set from the enabled
vendors. These two components are ILM assembly and back plate. To secure the two
assemblies, two types of fasteners are required a pair (2) of standard 6-32 thread
screws and a custom 6-32 thread shoulder screw. The reference design incorporates a
T-20 Torx* head fastener. The Torx* head fastener was chosen to ensure end users do
not inadvertently remove the ILM assembly and for consistency with the LGA1366
socket ILM. The Torx* head fastener is also less susceptible to driver slippage. Once
assembled the ILM is not required to be removed to install / remove the motherboard
from a chassis.
4.1.1ILM Assembly Design Overview
The ILM assembly consists of 4 major pieces: ILM cover, load lever, load plate and the
hinge frame assembly.
All of the pieces in the ILM assembly except the hinge frame and the screws used to
attach the back plate are fabricated from stainless steel. The hinge frame is plated. The
frame provides the hinge locations for the load lever and load plate. An insulator is preapplied to the bottom surface of the hinge frame.
The ILM assembly design ensures that once assembled to the back plate the only
features touching the board are the shoulder screw and the insulated hinge frame
assembly. The nominal gap of the load plate to the board is ~1 mm.
When closed the load plate applies two point loads onto the IHS at the “dimpled”
features shown in Figure 4-1. The reaction force from closing the load plate is
transmitted to the hinge frame assembly and through the fasteners to the back plate.
Some of the load is passed through the socket body to the board inducing a slight
compression on the solder joints.
A pin 1 indicator will be marked on the ILM assembly.
Thermal/Mechanical Specifications and Design Guidelines27
Figure 4-1. ILM Assembly with Installed Processor
Fasteners
Load
Lever
Load
Plate
Hinge /
Frame
Assy
Shoulder Screw
Pin 1 Indicator
Fasteners
Load
Lever
Load
Plate
Hinge /
Frame
Assy
Shoulder Screw
Pin 1 Indicator
Independent Loading Mechanism (ILM)
4.1.2ILM Back Plate Design Overview
The back plate is a flat steel back plate with pierced and extruded features for ILM
attach. A clearance hole is located at the center of the plate to allow access to test
points and backside capacitors if required. An insulator is pre-applied. A notch is placed
in one corner to assist in orienting the back plate during assembly.
Caution:Intel does NOT recommend using the server back plate for high-volume desktop
applications at this time as the server back plate test conditions cover a limited
envelope. Back plates and screws are similar in appearance. To prevent mixing,
different levels of differentiation between server and desktop back plate and screws
have been implemented.
For ILM back plate, three levels of differentiation have been implemented:
• Unique part numbers, please refer to part numbers listed in Appendix A.
• Desktop ILM back plate to use black lettering for marking versus server ILM back
plate to use yellow lettering for marking.
• Desktop ILM back plate using marking “115XDBP” versus server ILM back plate
using marking “115XSBP”.
Note:When reworking a BGA component or the socket that the heatsink, battery, ILM and
ILM Back Plate are removed prior to rework. The ILM back plate should also be
removed when reworking through hole mounted components in a mini-wave or solder
pot). The maximum temperature for the pre-applied insulator on the ILM is
approximately 106 °C.
28Thermal/Mechanical Specifications and Design Guidelines
Independent Loading Mechanism (ILM)
Die Cut
Insulator
Pierced & Extruded
Thread Features
Assembly
Orientation Feature
Die Cut
Insulator
Pierced & Extruded
Thread Features
Assembly
Orientation
Feature
Figure 4-2. Back Plate
4.1.3Shoulder Screw and Fasteners Design Overview
Note:The screws for Server ILM are different from Desktop design. The length of Server ILM
Note:Unique part numbers, please refer to Appendix A.
Note:The reference design incorporates a T-20 Torx* head fastener. The Torx* head fastener
The shoulder screw is fabricated from carbonized steel rod. The shoulder height and
diameter are integral to the mechanical performance of the ILM. The diameter provides
alignment of the load plate. The height of the shoulder ensures the proper loading of
the IHS to seat the processor on the socket contacts. The design assumes the shoulder
screw has a minimum yield strength of 235 MPa.
A dimensioned drawing of the shoulder screw is available for local sourcing of this
component. Please refer to Figure B-13 for the custom 6-32 thread shoulder screw
drawing.
The standard fasteners can be sourced locally. The design assumes this fastener has a
minimum yield strength of 235 MPa. Please refer to Figure B-14 for the standard 6-32
thread fasteners drawing.
screws are shorter than the Desktop screw length to satisfy Server secondary-side
clearance limitation.
was chosen to ensure end users do not inadvertently remove the ILM assembly and for
consistency with the LGA1366 socket ILM.
Thermal/Mechanical Specifications and Design Guidelines29
Figure 4-3. Shoulder Screw
Shoulder
6-32 thread
Cap
Independent Loading Mechanism (ILM)
4.2Assembly of ILM to a Motherboard
The ILM design allows a bottoms up assembly of the components to the board. See
Figure 4-4 for step by step assembly sequence.
1. Place the back plate in a fixture. The motherboard is aligned with the fixture.
2. Install the shoulder screw in the single hole near Pin 1 of the socket. Torque to a
minimum and recommended 8 inch-pounds, but not to exceed 10 inch-pounds.
3. Align and place the ILM assembly over the socket.
4. Install two (2) 6-32 fasteners. Torque to a minimum and recommended 8 inchpounds, but not to exceed 10 inch-pounds.
The thread length of the shoulder screw accommodates a nominal board thicknesses of
0.062”.
30Thermal/Mechanical Specifications and Design Guidelines
Independent Loading Mechanism (ILM)
Step 1Step 2
Step 3
Step 4
Step 1Step 2
Step 3
Step 4
Step 1Step 2
Step 3
Step 4
.
Figure 4-4. ILM Assembly
As indicated in Figure 4-5, the shoulder screw, socket protrusion and ILM key features
prevent 180 degree rotation of ILM cover assembly with respect to socket. The result is
a specific Pin 1 orientation with respect to ILM lever.
Thermal/Mechanical Specifications and Design Guidelines31
Figure 4-5. Pin1 and ILM Lever
Alignment
Features
Load plate not
shown for
clarity
Pin 1
Shoulder
Screw
Load
Lever
Independent Loading Mechanism (ILM)
4.3ILM Interchangeability
ILM assembly and ILM back plate built from the Intel controlled drawings are intended
to be interchangeable. Interchangeability is defined as an ILM from Vendor A will
demonstrate acceptable manufacturability and reliability with a socket body from
Vendor A, B or C. ILM assembly and ILM back plate from all vendors are also
interchangeable.
The ILM are an integral part of the socket validation testing. ILMs from each vendor will
be matrix tested with the socket bodies from each of the current vendors. The tests
would include: manufacturability, bake and thermal cycling.
See Appendix A for vendor part numbers that were tested.
Note:ILMs that are not compliant to the Intel controlled ILM drawings can not be assured to
be interchangeable.
4.4Markings
There are four markings on the ILM:
• 115XLM: Font type is Helvetica Bold - minimum 6 point (2.125 mm).
• Manufacturer's insignia (font size at supplier's discretion).
• Lot identification code (allows traceability of manufacturing date and location).
• Pin 1 indicator on the load plate.
All markings must be visible after the ILM is assembled on the motherboard.
115XLM and the manufacturer's insignia can be ink stamped or laser marked on the
side wall.
32Thermal/Mechanical Specifications and Design Guidelines
Independent Loading Mechanism (ILM)
4.5ILM Cover
Intel has developed an ILM Cover that will snap onto the ILM for the LGA115x socket
family. The ILM cover is intended to reduce the potential for socket contact damage
from operator and customer fingers being close to the socket contacts to remove or
install the pick and place cap. The ILM Cover concept is shown in Figure 4-6.
The ILM Cover is intended to be used in place of the pick and place cover once the ILM
is assembled to the motherboard. The ILM will be offered with the ILM Cover pre
assembled as well as offered as a discrete component.
ILM Cover features:
• Pre-assembled by the ILM vendors to the ILM load plate. It will also be offered as a
discrete component.
• The ILM cover will pop off if a processor is installed in the socket, and the ILM
Cover and ILM are from the same manufacturer.
• ILM Cover can be installed while the ILM is open.
• Maintain inter-changeability between validated ILM vendors for LGA115x socket,
with the exception noted below
• The ILM cover for the LGA115x socket will have a flammability rating of V-2 per UL
60950-1.
1
.
Note:The ILM Cover pop off feature is not supported if the ILM Covers are interchanged on
different vendor’s ILMs.
Thermal/Mechanical Specifications and Design Guidelines33
Figure 4-6. ILM Cover
Step 3: Close ILM
Step 1: PnP Cover installed
during ILM assembly
Step 2: Remove PnP Cover
Independent Loading Mechanism (ILM)
As indicated in Figure 4-6, the pick and place cover should remain installed during ILM
assembly to the motherboard. After assembly, the pick and place cover is removed, the
ILM Cover installed and the ILM mechanism closed. The ILM Cover is designed to pop
off if the pick and place cover is accidentally left in place and the ILM closed with the
ILM Cover installed. This is shown in Figure 4-7.
34Thermal/Mechanical Specifications and Design Guidelines
Independent Loading Mechanism (ILM)
Figure 4-7. ILM Cover and PnP Cover Interference
As indicated in Figure 4-7, the pick and place cover cannot remain in place and used in
conjunction with the ILM Cover. The ILM Cover is designed to interfere and pop off if
the pick and place cover is unintentionally left in place. The ILM cover will also interfere
and pop off if the ILM is closed with a processor in place in the socket.
§
Thermal/Mechanical Specifications and Design Guidelines35
Independent Loading Mechanism (ILM)
36Thermal/Mechanical Specifications and Design Guidelines
LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications
5LGA1155 Socket and ILM
Electrical, Mechanical and
Environmental Specifications
This chapter describes the electrical, mechanical and environmental specifications for
the LGA1155 socket and the Independent Loading Mechanism.
5.1Component Mass
Table 5-1.Socket Component Mass
ComponentMass
Socket Body, Contacts and PnP Cover10 g
ILM Cover29 g
ILM Back Plate38 g
5.2Package/Socket Stackup Height
Ta b le 5 - 2 provides the stackup height of a processor in the 1155-land LGA package and
LGA1155 socket with the ILM closed and the processor fully seated in the socket.
Table 5-2.1155-land Package and LGA1155 Socket Stackup Height
ComponentStackup HeightNote
Integrated Stackup Height
From Top of Board to Top of IHS
Socket Nominal Seating Plane Height 3.4 ± 0.2 mm1
Package Nominal Thickness (lands to top of IHS)4.381 ± 0.269 mm1
Notes:
1.This data is provided for information only, and should be derived from: (a) the height of the socket seating
plane above the motherboard after reflow, given in Appendix C, (b) the height of the package, from the
package seating plane to the top of the IHS, and accounting for its nominal variation and tolerances that
are given in the corresponding processor data sheet.
2.The integrated stackup height value is a RSS calculation based on current and planned processors that will
use the ILM design.
(mm)
7.781 ± 0.335 mm2
Thermal/Mechanical Specifications and Design Guidelines37
LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications
5.3Loading Specifications
The socket will be tested against the conditions listed in Chapter 10 with heatsink and
the ILM attached, under the loading conditions outlined in this section.
Tab l e 5- 3 provides load specifications for the LGA1155 socket with the ILM installed.
The maximum limits should not be exceeded during heatsink assembly, shipping
conditions, or standard use condition. Exceeding these limits during test may result in
component failure. The socket body should not be used as a mechanical reference or
load-bearing surface for thermal solutions.
Table 5-3.Socket & ILM Mechanical Specifications
ParameterMinMaxNotes
ILM static compressive load on processor IHS311 N [70 lbf]600 N [135 lbf]3, 4, 7, 8
Heatsink static compressive load0 N [0 lbf]222 N [50 lbf]1, 2, 3
Pick & Place cover insertion forceN/A10.2 N [2.3 lbf]-
Pick & Place cover removal force2.2N [0.5 lbf]7.56 N [1.7 lbf]9
Load lever actuation forceN/A20.9 N [4.7 lbf] in the
Maximum heatsink massN/A500g10
311 N [70 lbf]822 N [185 lbf]3, 4, 7, 8
N/A712 N [160 lbf ] 1, 3, 5, 6
vertical direction
10.2 N [2.3 lbf] in the
lateral direction.
-
Notes:
1.These specifications apply to uniform compressive loading in a direction perpendicular to the IHS top
surface.
2.This is the minimum and maximum static force that can be applied by the heatsink and it’s retention
solution to maintain the heatsink to IHS interface. This does not imply the Intel reference TIM is validated
to these limits.
3.Loading limits are for the LGA1155 socket.
4.This minimum limit defines the static compressive force required to electrically seat the processor onto the
socket contacts. The minimum load is a beginning of life load.
5.Dynamic loading is defined as a load a 4.3 m/s [170 in/s] minimum velocity change average load
superimposed on the static load requirement.
6.Test condition used a heatsink mass of 500gm [1.102 lb.] with 50 g acceleration (table input) and an
assumed 2X Dynamic Acceleration Factor (DAF). The dynamic portion of this specification in the product
application can have flexibility in specific values. The ultimate product of mass times acceleration plus static
heatsink load should not exceed this limit.
7.The maximum BOL value and must not be exceeded at any point in the product life.
8.The minimum value is a beginning of life loading requirement based on load degradation over time.
9.The maximum removal force is the flick up removal upwards thumb force (measured at 45o), not
applicable to SMT operation for system assembly. Only the minimum removal force is applicable to vertical
removal in SMT operation for system assembly.
10. The maximum heatsink mass includes the core, extrusion, fan and fasteners. This mass limit is evaluated
using the POR heatsink attach to the PCB.
38Thermal/Mechanical Specifications and Design Guidelines
LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications
5.4Electrical Requirements
LGA1155 socket electrical requirements are measured from the socket-seating plane of
the processor to the component side of the socket PCB to which it is attached. All
specifications are maximum values (unless otherwise stated) for a single socket
contact, but includes effects of adjacent contacts where indicated.
Table 5-4.Electrical Requirements for LGA1155 Socket
ParameterValueComment
The inductance calculated for two contacts,
Mated loop inductance, Loop<3.6nH
Socket Average Contact Resistance
(EOL)
Max Individual Contact Resistance
(EOL)
Bulk Resistance Increase
Dielectric Withstand Voltage360 Volts RMS
Insulation Resistance800 M
19 mOhm
100 mOhm
3 m
considering one forward conductor and one
return conductor. These values must be satisfied
at the worst-case height of the socket.
The socket average contact resistance target is
calculated from the following equation:
sum (Ni X LLCRi) / sum (Ni)
• LLCRi is the chain resistance defined as the
resistance of each chain minus resistance of
shorting bars divided by number of lands in
the daisy chain.
• Ni is the number of contacts within a chain.
• I is the number of daisy chain, ranging from
1 to 119 (total number of daisy chains).
The specification listed is at room temperature
and has to be satisfied at all time.
The specification listed is at room temperature
and has to be satisfied at all time.
Socket Contact Resistance:
the socket contact, solderball, and interface
resistance to the interposer land; gaps included.
The bulk resistance increase per contact from
25°C to 100°C.
The resistance of
Thermal/Mechanical Specifications and Design Guidelines39
LGA1155 Socket and ILM Electrical, Mechanical and Environmental Specifications
Establish the
market/expected use
environment for the
technology
Develop Speculative
stress conditions based on
historical data, content
experts, and literature
search
Perform stressing to
validate accelerated
stressing assumptions and
determine acceleration
factors
Freeze stressing
requirements and perform
additional data turns
5.5Environmental Requirements
Design, including materials, shall be consistent with the manufacture of units that meet
the following environmental reference points.
The reliability targets in this section are based on the expected field use environment
for these products. The test sequence for new sockets will be developed using the
knowledge-based reliability evaluation methodology, which is acceleration factor
dependent. A simplified process flow of this methodology can be seen in Figure 5-1.
Figure 5-1. Flow Chart of Knowledge-Based Reliability Evaluation Methodology
40Thermal/Mechanical Specifications and Design Guidelines
A detailed description of this methodology can be found at: ftp://download.intel.com/
technology/itj/q32000/pdf/reliability.pdf.
§
Thermal Specifications
6Thermal Specifications
The processor requires a thermal solution to maintain temperatures within its operating
limits. Any attempt to operate the processor outside these operating limits may result
in permanent damage to the processor and potentially other components within the
system. Maintaining the proper thermal environment is key to reliable, long-term
system operation.
A complete solution includes both component and system level thermal management
features. Component level thermal solutions can include active or passive heatsinks
attached to the processor integrated heat spreader (IHS).
This chapter provides data necessary for developing a complete thermal solution. For
more information on an ATX reference thermal solution design, please refer to
Chapter 9.
6.1Thermal Specifications
To allow the optimal operation and long-term reliability of Intel processor-based
systems, the processor must remain within the minimum and maximum case
temperature (T
Thermal solutions not designed to provide this level of thermal capability may affect the
long-term reliability of the processor and system. For more details on thermal solution
design, please refer to the Chapter 9.
) specifications as defined by the applicable thermal profile.
CASE
The processors implement a methodology for managing processor temperatures which
is intended to support acoustic noise reduction through fan speed control and to assure
processor reliability. Selection of the appropriate fan speed is based on the relative
temperature data reported by the processor’s Digital Temperature Sensor (DTS). The
DTS can be read via the Platform Environment Control Interface (PECI) as described in
Chapter 7. Alternatively, when PECI is monitored by the PCH, the processor
temperature can be read from the PCH via the SMBUS protocol defined in Embedded Controller Support Provided by Platform Controller Hub (PCH). The temperature
report ed over PECI i s always a negative value and represents a delta below the onset of
thermal control circuit (TCC) activation, as indicated by PROCHOT# (see Section 6.2,
Processor Thermal Features). Systems that implement fan speed control must be
designed to use this data. Systems that do not alter the fan speed only need to ensure
the case temperature meets the thermal profile specifications.
A single integer change in the PECI value corresponds to approximately 1 °C change in
processor temperature. Although each processors DTS is factory calibrated, the
accuracy of the DTS will vary from part to part and may also vary slightly with
temperature and voltage. In general, each integer change in PECI should equal a
temperature change between 0.9 °C and 1.1 °C.
Analysis indicates that real applications are unlikely to cause the processor to consume
maximum power dissipation for sustained time periods. Intel recommends that
complete thermal solution designs target the Thermal Design Power (TDP), instead of
the maximum processor power consumption. The Adaptive Thermal Monitor feature is
intended to help protect the processor in the event that an application exceeds the TDP
recommendation for a sustained time period. For more details on this feature, refer to
Thermal/Mechanical Specifications and Design Guidelines41
Section 6.2. To ensure maximum flexibility for future processors, systems should be
designed to the Thermal Solution Capability guidelines, even if a processor with lower
power dissipation is currently planned.
Table 6-1.Processor Thermal Specifications
Thermal Specifications
Max
Power
Package
C3
1,2,6
(W)
Product
®
Core™ i7-
Intel
2000 and i5-2000
desktop processor
series (Quad Core
95W)
®
Intel
Core™ i72000 and i5-2000
desktop processor
series (Quad Core
Max
Power
Package
C1E
1,2,6
(W)
28225.595
25185.5
65W)
®
Core™ i3-
Intel
2000 desktop
processor series
(Dual Core 65W)
®
Core™ i5-
Intel
2000 desktop
processor series
(Quad Core 45W)
®
Core™ i5-
Intel
2000 and i3-2000
desktop processor
series (Dual Core
35W)
Notes:
1.The package C-state power is the worst case power in the system configured as follows:
- Memory configured for DDR3 1333 and populated with 2 DIMM per channel.
- DMI and PCIe links are at L1.
2.Specification at Tj of 50 °C and minimum voltage loadline.
3.Specification at Tj of 35 °C and minimum voltage loadline.
4.These values are specified at V
Systems must be designed to ensure the processor is not to be subjected to any static V
combination wherein V
the EDS.
5.Thermal Design Power (TDP) should be used for processor thermal solution design targets. TDP is not the
maximum power that the processor can dissipate. TDP is measured at DTS = -1.
TDP is achieved with the Memory configured for DDR3 1333 and 2 DIMMs per channel.
6.Specified by design characterization.
7.When the Multi-monitor feature is enabled (running 4 displays simultaneously) there could be corner cases
with additional system thermal impact on the SA and VCCP rails ≤1.5W (maximum of 1.5W measured on
16 lane PCIe card). The integrator should perform additional thermal validation with Multi-monitor enabled
to ensure thermal compliance.
CCP
20125
20125.545
1810535
CC_MAX
exceeds V
and V
CCP_MAX
for all other voltage rails for all processor frequencies.
NOM
at specified I
Max
Power
Package
C6
1,3,6
(W)
TTV
Thermal
Design
Power
4,5,7
(W)
Min TCASE
(°C)
65
5
and ICC
. Please refer to the loadline specifications in
CCP
CC
Maximum
TTV
TCASE
(°C)
Figure 6-1
& Table 6 -2
Figure 6-2
& Table 6 -3
Figure 6-3
& Table 6 -4
Figure 6-4
& Table 6 -5
42Thermal/Mechanical Specifications and Design Guidelines
Thermal Specifications
6.1.1Intel® Core™ i7-2000 and i5-2000 Desktop Processor
Series (Quad Core 95W) Thermal Profile
Figure 6-1. Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000
Desktop Processor Series (Quad Core 95W)
Notes:
1.Please refer to Ta bl e 6 - 2 for discrete points that constitute the thermal profile.
2.Refer to Chapter 9 and Chapter 10 for system and environmental implementation details.
Table 6-2.Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000
Desktop Processor Series (Quad Core 95W)
Power (W)T
045.15059.6
245.75260.2
446.35460.8
646.85661.3
847.45861.9
1048.06062.5
1248.66263.1
1449.26463.7
1649.76664.2
1850.36864.8
2050.97065.4
Thermal/Mechanical Specifications and Design Guidelines43
CASE_MAX
(C)Pow er (W)T
CASE_MAX
(C)
Thermal Specifications
Table 6-2.Thermal Test Vehicle Thermal Profile for Intel
®
Core™ i7-2000 and i5-2000
Desktop Processor Series (Quad Core 95W)
Power (W)T
2251.57266.0
2452.17466.6
2652.67667.1
2853.27867.7
3053.88068.3
3254.48268.9
3455.08469.5
3655.58670.0
3856.18870.6
4056.79071.2
4257.39271.8
4457.99472.4
4658.49572.6
4859.0
CASE_MAX
(C)Power (W)T
CASE_MAX
(C)
6.1.2Intel® Core™ i7-2000 and i5-2000 Desktop Processor
Series (Quad Core 65W) and Intel® Core™ i3-2000
Desktop Processor Series (Dual Core 65W) Thermal
Profile
Figure 6-2. Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000
Desktop Processor Series (Quad Core 65W) and Intel
®
Core™ i3-2000 Desktop
Processor Series (Dual Core 65W)
Notes:
1.Please refer to Ta bl e 6 -3 for discrete points that constitute the thermal profile.
2.Refer to Chapter 9 and Chapter 10 for system and environmental implementation details.
44Thermal/Mechanical Specifications and Design Guidelines
Thermal Specifications
Table 6-3.Thermal Test Vehicle Thermal Profile for Intel® Core™ i7-2000 and i5-2000
Desktop Processor Series (Quad Core 65W) and Intel
®
Core™ i3-2000 Desktop
Processor Series (Dual Core 65W)
Power (W)T
044.43457.3
245.23658.1
445.93858.8
646.74059.6
847.44260.4
1048.24461.1
1249.04661.9
1449.74862.6
1650.55063.4
1851.25264.2
2052.05464.9
2252.85665.7
2453.55866.4
2654.36067.2
2855.06268.0
3055.86468.7
3256.66569.1
3457.300
CASE_MAX
(C)Pow er (W)T
CASE_MAX
(C)
Thermal/Mechanical Specifications and Design Guidelines45
Figure 6-3. Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 Desktop
Processor Series (Quad Core 45W)
Notes:
1.Please refer to Ta bl e 6 -4 for discrete points that constitute the thermal profile.
2.Refer to Chapter 9 and Chapter 10 for system and environmental implementation details.
Table 6-4.Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 Desktop
Processor Series (Quad Core 45W)
Power (W)T
048.22459.7
249.22660.7
450.12861.6
651.13062.6
852.03263.6
1053.03464.5
1254.093665.5
1454.93866.4
1655.94067.4
1856.84268.4
2057.84469.3
2258.84569.8
CASE_MAX
(C)Power (W)T
CASE_MAX
(C)
46Thermal/Mechanical Specifications and Design Guidelines
Thermal Specifications
6.1.4Intel® Core™ i5-2000 and i3-2000 Desktop Processor
Series (Dual Core 35W) Thermal Profile
Figure 6-4. Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 and i3-2000
Desktop Processor Series (Dual Core 35W)
Notes:
1.Please refer to Ta bl e 6 - 5 for discrete points that constitute the thermal profile.
2.Refer to Chapter 9 and Chapter 10 for system and environmental implementation details.
Table 6-5.Thermal Test Vehicle Thermal Profile for Intel® Core™ i5-2000 and i3-2000
Desktop Processor Series (Dual Core 35W)
Power (W)T
048.22057.8
249.22258.8
450.12459.7
651.12660.7
852.02861.6
1053.03062.6
1254.03263.6
1454.93464.5
1655.93565.0
1856.8
CASE_MAX
(C)Pow er (W)T
CASE_MAX
(C)
Thermal/Mechanical Specifications and Design Guidelines47
Thermal Specifications
6.1.5Processor Specification for Operation Where Digital
Thermal Sensor Exceeds T
When the DTS value is less than T
the speed of the thermal solution fan. This remains the same as with the previous
guidance for fan speed control.
CONTROL
CONTROL
the fan speed control algorithm can reduce
During operation, when the DTS value is greater than T
algorithm must drive the fan speed to meet or exceed the target thermal solution
performance (CA) shown in Tab l e 6- 6 for the Intel® Core™ i7-2000 and i5-2000
desktop processor series (Quad Core 95W), Tab l e 6 - 7 for the Intel
i5-2000 desktop processor series (Quad Core 65W) and Intel® Pentium® desktop
processor 800 and 600 series (Dual Core 65W), Ta b le 6 -8 for the Intel® Core™ i5-2000
desktop processor series (Quad Core 45W) and Tab l e 6 - 9 for the Intel
and i3-2000 desktop processor series (Dual Core 35W) . To get the full acoustic benefit
of the DTS specification, ambient temperature monitoring is necessary. See Chapter 8
for details on characterizing the fan speed to
measurement.
Table 6-6.Thermal Solution Performance above T
and i5-2000 Desktop Processor Series (Quad Core 95W) (Sheet 1 of 2)
T
1
AMBIENT
45.10.2900.289
44.00.3100.301
43.00.3280.312
42.00.3460.322
41.00.3640.333
40.00.3830.343
39.00.4010.354
38.00.4190.364
37.00.4370.375
36.00.4550.385
35.00.4730.396
34.00.4910.406
33.00.5100.417
32.00.5280.427
31.00.5460.438
30.00.5640.448
29.00.5820.459
28.00.6000.469
27.00.6180.480
26.00.6370.491
25.00.6550.501
24.00.6730.512
23.00.6910.522
DTS = T
CA
CONTROL
at
CA
CONTROL
CONTROL
, the fan speed control
®
Core™ i7-2000 and
®
Core™ i5-2000
and ambient temperature
for the Intel® Core™ i7-2000
at
2
CA
DTS = -1
3
48Thermal/Mechanical Specifications and Design Guidelines
Thermal Specifications
Table 6-6.Thermal Solution Performance above T
and i5-2000 Desktop Processor Series (Quad Core 95W) (Sheet 2 of 2)
AMBIENT
1
T
22.00.7090.533
21.00.7270.543
20.00.7460.554
Notes:
1.The ambient temperature is measured at the inlet to the processor thermal solution.
2.This column can be expressed as a function of T
= 0.29 + (45.1 - T
Y
CA
3.This column can be expressed as a function of T
= 0.29 + (45.1 - T
Y
CA
AMBIENT
AMBIENT
) x 0.0181
) x 0.0105
DTS = T
AMBIENT
AMBIENT
Table 6-7.Thermal Solution Performance above T
and i5-2000 Desktop Processor Series (Quad Core 65W) and Intel
2000 Desktop Processor Series (Dual Core 65W)
AMBIENT
1
T
44.40.3800.380
43.00.4170.402
42.00.4430.417
41.00.4690.432
40.00.4950.448
39.00.5210.463
38.00.5470.478
37.00.5730.494
36.00.5990.509
35.00.6250.525
34.00.6510.540
33.00.6770.555
32.00.7030.571
31.00.7290.586
30.00.7550.602
29.00.7820.617
28.00.8080.632
27.00.8340.648
26.00.8600.663
25.00.8860.678
24.00.9120.694
23.00.9380.709
22.00.9640.725
21.00.9900.740
20.01.0160.755
19.01.0420.771
Notes:
1.The ambient temperature is measured at the inlet to the processor thermal solution.
2.This column can be expressed as a function of T
= 0.38 + (44.4 - T
Y
CA
3.This column can be expressed as a function of T
= 0.38 + (44.4 - T
Y
CA
AMBIENT
AMBIENT
) x 0.0261
) x 0.015
DTS = T
AMBIENT
AMBIENT
CONTROL
at
CA
CONTROL
for the Intel® Core™ i7-2000
2
by the following equation:
by the following equation:
CONTROL
at
CA
CONTROL
for the Intel® Core™ i7-2000
2
by the following equation:
by the following equation:
at
CA
DTS = -1
®
at
CA
DTS = -1
3
Core™ i3-
3
Thermal/Mechanical Specifications and Design Guidelines49
Thermal Specifications
Table 6-8.Thermal Solution Performance above T
Desktop Processor Series (Quad Core 45W)
AMBIENT
1
T
48.20.4800.480
47.00.5250.507
46.00.5630.529
45.00.6010.551
44.00.6380.573
43.00.6760.596
42.00.7140.618
41.00.7510.640
40.00.7890.662
39.00.8270.684
38.00.8640.707
37.00.9020.729
36.00.9400.751
35.00.9770.773
34.01.0150.796
33.01.0530.818
32.01.0900.840
31.01.1280.862
30.01.1650.884
29.01.2030.907
28.01.2410.929
27.01.2780.951
26.01.3160.973
25.01.3540.996
24.01.3911.018
23.01.4291.040
DTS = T
CONTROL
at
CA
CONTROL
for the Intel® Core™ i5-2000
at
CA
2
DTS = -1
3
Notes:
1.The ambient temperature is measured at the inlet to the processor thermal solution.
2.This column can be expressed as a function of T
Y
3.This colu4n can be expressed as a function of T
= 0.48 + (48.2 - T
Y
CA
= 0.48 + (48.2 - T
CA
AMBIENT
AMBIENT
) x 0.0377
) x 0.0222
by the following equation:
AMBIENT
by the following equation:
AMBIENT
50Thermal/Mechanical Specifications and Design Guidelines
Thermal Specifications
Table 6-9.Thermal Solution Performance above T
and i3-2000 Desktop Processor Series (Dual Core 35W)
AMBIENT
1
T
48.20.4800.480
47.00.5380.514
46.00.5870.543
45.00.6350.571
44.00.6830.600
43.00.7320.629
42.00.7800.657
41.00.8290.686
40.00.8770.714
39.00.9260.743
38.00.9740.771
37.01.0220.800
36.01.0710.829
35.01.1190.857
34.01.1680.886
33.01.2160.914
32.01.2650.943
31.01.3130.971
30.01.3611.000
29.01.4101.029
28.01.4581.057
27.01.5071.086
26.01.5551.114
25.01.6031.143
24.01.6521.171
23.01.7001.200
DTS = T
CONTROL
at
CA
CONTROL
for the Intel® Core™ i5-2000
at
CA
2
DTS = -1
3
Notes:
1.The ambient temperature is measured at the inlet to the processor thermal solution.
2.This column can be expressed as a function of T
Y
= 0.48 + (48.2 - T
CA
3.This column can be expressed as a function of T
= 0.48 + (48.2 - T
Y
CA
AMBIENT
AMBIENT
) x 0.0484
) x 0.0286
by the following equation:
AMBIENT
by the following equation:
AMBIENT
Thermal/Mechanical Specifications and Design Guidelines51
6.1.6Thermal Metrology
37.5
37.5
Measure T
CASE
at
the geometric
center of the
package
Thermal Specifications
The maximum TTV case temperatures (T
appropriate TTV thermal profile earlier in this chapter. The TTV T
geometric top center of the TTV integrated heat spreader (IHS). Figure 6-5 illustrates
the location where T
temperature measurements should be made. See Figure B-12
CASE
for drawing showing the thermocouple attach to the TTV package.
Figure 6-5. TTV Case Temperature (T
CASE-MAX
) Measurement Location
CASE
) can be derived from the data in the
is measured at the
CASE
Note:The following supplier can machine the groove and attach a thermocouple to the IHS.
The supplier is listed below as a convenience to Intel’s general customers and the list
may be subject to change without notice. THERM-X OF CALIFORNIA Inc, 3200
Investment Blvd, Hayward, Ca 94545. Ernesto B Valencia +1-510-441-7566 Ext. 242
ernestov@therm-x.com. The vendor part number is XTMS1565.
52Thermal/Mechanical Specifications and Design Guidelines
Thermal Specifications
6.2Processor Thermal Features
6.2.1Processor Temperature
A new feature in the processors is a software readable field in the
IA32_TEMPERATURE_TARGET register that contains the minimum temperature at
which the TCC will be activated and PROCHOT# will be asserted. The TCC activation
temperature is calibrated on a part-by-part basis and normal factory variation may
result in the actual TCC activation temperature being higher than the value listed in the
register. TCC activation temperatures may change based on processor stepping,
frequency or manufacturing efficiencies.
6.2.2Adaptive Thermal Monitor
The Adaptive Thermal Monitor feature provides an enhanced method for controlling the
processor temperature when the processor silicon exceeds the Thermal Control Circuit
(TCC) activation temperature. Adaptive Thermal Monitor uses TCC activation to reduce
processor power via a combination of methods. The first method (Frequency/VID
control, similar to Thermal Monitor 2 (TM2) in previous generation processors) involves
the processor reducing its operating frequency (via the core ratio multiplier) and input
voltage (via the VID signals). This combination of lower frequency and VID results in a
reduction of the processor power consumption. The second method (clock modulation,
known as Thermal Monitor 1 or TM1 in previous generation processors) reduces power
consumption by modulating (starting and stopping) the internal processor core clocks.
The processor intelligently selects the appropriate TCC method to use on a dynamic
basis. BIOS is not required to select a specific method (as with previous-generation
processors supporting TM1 or TM2). The temperature at which Adaptive Thermal
Monitor activates the Thermal Control Circuit is factory calibrated and is not user
configurable. Snooping and interrupt processing are performed in the normal manner
while the TCC is active.
When the TCC activation temperature is reached, the processor will initiate TM2 in
attempt to reduce its temperature. If TM2 is unable to reduce the processor
temperature, then TM1 will be also be activated. TM1 and TM2 will work together
(clocks will be modulated at the lowest frequency ratio) to reduce power dissipation
and temperature.
With a properly designed and characterized thermal solution, it is anticipated that the
TCC would only be activated for very short periods of time when running the most
power intensive applications. The processor performance impact due to these brief
periods of TCC activation is expected to be so minor that it would be immeasurable. An
under-designed thermal solution that is not able to prevent excessive activation of the
TCC in the anticipated ambient environment may cause a noticeable performance loss,
and in some cases may result in a T
temperature and may affect the long-term reliability of the processor. In addition, a
thermal solution that is significantly under-designed may not be capable of cooling the
processor even when the TCC is active continuously. Refer to the appropriate Thermal
Mechanical Design Guidelines for information on designing a compliant thermal
solution.
The Thermal Monitor does not require any additional hardware, software drivers, or
interrupt handling routines. The following sections provide more details on the different
TCC mechanisms used by the processor.
Thermal/Mechanical Specifications and Design Guidelines53
that exceeds the specified maximum
CASE
6.2.2.1Frequency/VID Control
When the Digital Temperature Sensor (DTS) reaches a value of 0 (DTS temperatures
reported via PECI may not equal zero when PROCHOT# is activated, see
Section 6.2.2.5 for further details), the TCC will be activated and the PROCHOT# signal
will be asserted. This indicates the processors' temperature has met or exceeded the
factory calibrated trip temperature and it will take action to reduce the temperature.
Upon activation of the TCC, the processor will stop the core clocks, reduce the core
ratio multiplier by 1 ratio and restart the clocks. All processor activity stops during this
frequency transition which occurs within 2 us. Once the clocks have been restarted at
the new lower frequency, processor activity resumes while the voltage requested by the
VID lines is stepped down to the minimum possible for the particular frequency.
Running the processor at the lower frequency and voltage will reduce power
consumption and should allow the processor to cool off. If after 1ms the processor is
still too hot (the temperature has not dropped below the TCC activation point, DTS still
= 0 and PROCHOT is still active), then a second frequency and voltage transition will
take place. This sequence of temperature checking and Frequency/VID reduction will
continue until either the minimum frequency has been reached or the processor
temperature has dropped below the TCC activation point.
If the processor temperature remains above the TCC activation point even after the
minimum frequency has been reached, then clock modulation (described below) at that
minimum frequency will be initiated.
Thermal Specifications
There is no end user software or hardware mechanism to initiate this automated TCC
activation behavior.
A small amount of hysteresis has been included to prevent rapid active/inactive
transitions of the TCC when the processor temperature is near the TCC activation
temperature. Once the temperature has dropped below the trip temperature, and the
hysteresis timer has expired, the operating frequency and voltage transition back to
the normal system operating point via the intermediate VID/frequency points.
Transition of the VID code will occur first, to insure proper operation as the frequency is
increased. Refer to Figure 6-6 for an illustration of this ordering.
54Thermal/Mechanical Specifications and Design Guidelines
Thermal Specifications
Temperature
f
MAX
f
1
f
2
VIDf
MAX
VID
Frequency
VIDf
2
VIDf
1
PROCHOT#
Temperature
f
MAX
f
1
f
2
VIDf
MAX
VID
Frequency
VIDf
2
VIDf
1
PROCHOT#
Figure 6-6. Frequency and Voltage Ordering
6.2.2.2Clock Modulation
Clock modulation is a second method of thermal control available to the processor.
Clock modulation is performed by rapidly turning the clocks off and on at a duty cycle
that should reduce power dissipation by about 50% (typically a 30-50% duty cycle).
Clocks often will not be off for more than 32 microseconds when the TCC is active.
Cycle times are independent of processor frequency. The duty cycle for the TCC, when
activated by the Thermal Monitor, is factory configured and cannot be modified.
It is possible for software to initiate clock modulation with configurable duty cycles.
A small amount of hysteresis has been included to prevent rapid active/inactive
transitions of the TCC when the processor temperature is near its maximum operating
temperature. Once the temperature has dropped below the maximum operating
temperature, and the hysteresis timer has expired, the TCC goes inactive and clock
modulation ceases.
6.2.2.3Immediate Transition to combined TM1 and TM2
As mentioned above, when the TCC is activated the processor will sequentially step
down the ratio multipliers and VIDs in an attempt to reduce the silicon temperature. If
the temperature continues to increase and exceeds the TCC activation temperature by
approximately 5
the processor will immediately transition to the combined TM1/TM2 condition. The
processor will remain in this state until the temperature has dropped below the TCC
activation point. Once below the TCC activation temperature, TM1 will be discontinued
and TM2 will be exited by stepping up to the appropriate ratio/VID state.
o
C before the lowest ratio/VID combination has been reached, then
Thermal/Mechanical Specifications and Design Guidelines55
6.2.2.4Critical Temperature Flag
If TM2 is unable to reduce the processor temperature, then TM1 will be also be
activated. TM1 and TM2 will then work together to reduce power dissipation and
temperature. It is expected that only a catastrophic thermal solution failure would
create a situation where both TM1 and TM2 are active.
If TM1 and TM2 have both been active for greater than 20ms and the processor
temperature has not dropped below the TCC activation point, then the Critical
Temperature Flag in the IA32_THERM_STATUS MSR will be set. This flag is an indicator
of a catastrophic thermal solution failure and that the processor cannot reduce its
temperature. Unless immediate action is taken to resolve the failure, the processor will
probably reach the Thermtrip temperature (see Section 6.2.3 Thermtrip Signal) within
a short time. In order to prevent possible permanent silicon damage, Intel
recommends removing power from the processor within ½ second of the Critical
Temperature Flag being set
6.2.2.5PROCHOT# Signal
An external signal, PROCHOT# (processor hot), is asserted when the processor core
temperature has exceeded its specification. If Adaptive Thermal Monitor is enabled
(note it must be enabled for the processor to be operating within specification), the
TCC will be active when PROCHOT# is asserted.
The processor can be configured to generate an interrupt upon the assertion or deassertion of PROCHOT#.
Although the PROCHOT# signal is an output by default, it may be configured as bidirectional. When configured in bi-directional mode, it is either an output indicating the
processor has exceeded its TCC activation temperature or it can be driven from an
external source (such as, a voltage regulator) to activate the TCC. The ability to
activate the TCC via PROCHOT# can provide a means for thermal protection of system
components.
As an output, PROCHOT# (Processor Hot) will go active when the processor
temperature monitoring sensor detects that one or more cores has reached its
maximum safe operating temperature. This indicates that the processor Thermal
Control Circuit (TCC) has been activated, if enabled. As an input, assertion of
PROCHOT# by the system will activate the TCC for all cores. TCC activation when
PROCHOT# is asserted by the system will result in the processor immediately
transitioning to the minimum frequency and corresponding voltage (using Freq/VID
control). Clock modulation is not activated in this case. The TCC will remain active until
the system de-asserts PROCHOT#.
Use of PROCHOT# in bi-directional mode can allow VR thermal designs to target
maximum sustained current instead of maximum current. Systems should still provide
proper cooling for the VR, and rely on PROCHOT# only as a backup in case of system
cooling failure. The system thermal design should allow the power delivery circuitry to
operate within its temperature specification even while the processor is operating at its
Thermal Design Power.
Thermal Specifications
6.2.3THERMTRIP# Signal
Regardless of whether or not Adaptive Thermal Monitor is enabled, in the event of a
catastrophic cooling failure, the processor will automatically shut down when the silicon
has reached an elevated temperature (refer to the THERMTRIP# definition in the EDS).
At this point, the THERMTRIP# signal will go active and stay active as described in the
EDS. THERMTRIP# activation is independent of processor activity. If THERMTRIP# is
asserted, processor core voltage (V
in EDS. The temperature at which THERMTRIP# asserts is not user configurable and is
not software visible.
56Thermal/Mechanical Specifications and Design Guidelines
) must be removed within the timeframe defined
CC
Thermal Specifications
6.3Intel® Turbo Boost Technology
Intel® Turbo Boost Technology is a feature that allows the processor to
opportunistically and automatically run faster than its rated operating core and/or
render clock frequency when there is sufficient power headroom, and the product is
within specified temperature and current limits. The Intel
feature is designed to increase performance of both multi-threaded and singlethreaded workloads. The processor supports a Turbo mode where the processor can
utilize the thermal capacitance associated with the package and run at power levels
higher than TDP power for short durations. This improves the system responsiveness
for short, bursty usage conditions. The turbo feature needs to be properly enabled by
BIOS for the processor to operate with maximum performance. Since the turbo feature
is configurable and dependent on many platform design limits outside of the processor
control, the maximum performance cannot be guaranteed.
Turbo Mode availability is independent of the number of active cores; however, the
Turbo Mode frequency is dynamic and dependent on the instantaneous application
power load, the number of active cores, user configurable settings, operating
environment and system design. Intel
on all SKUs.
®
Turbo Boost Technology may not be available
6.3.1Intel® Turbo Boost Technology Frequency
®
Turbo Boost Technology
The processor’s rated frequency assumes that all execution cores are running an
application at the Thermal Design Power (TDP). However, under typical operation, not
all cores are active. Therefore most applications are consuming less than the TDP at the
rated frequency. To take advantage of the available TDP headroom, the active cores can
increase their operating frequency.
To determine the highest performance frequency amongst active cores, the processor
takes the following into consideration:
• The number of cores operating in the C0 state.
• The estimated current consumption.
• The estimated power consumption.
•The temperature.
Any of these factors can affect the maximum frequency for a given workload. If the
power, current, or thermal limit is reached, the processor will automatically reduce the
frequency to stay with its TDP limit.
Note:Intel Turbo Boost Technology processor frequencies are only active if the operating
system is requesting the P0 state.
6.3.2Intel® Turbo Boost Technology Graphics Frequency
Graphics render frequency is selected by the processor dynamically based on the
graphics workload demand. The processor can optimize both processor and integrated
graphics performance through managing total package power. For the integrated
graphics, this could mean an increase in the render core frequency (above its base
frequency) and increased graphics performance. In addition, the processor core can
increase its frequency higher than it would without power sharing.
Thermal/Mechanical Specifications and Design Guidelines57
Thermal Specifications
Enabling Intel® Turbo Boost Technology will maximize the performance of the
processor core and the graphics render frequency within the specified package power
levels. Compared with previous generation products, Intel
will increase the ratio of application power to TDP. Thus, thermal solutions and platform
cooling that are designed to less than thermal design guidance might experience
thermal and performance issues since more applications will tend to run at the
maximum power limit for significant periods of time.
®
Turbo Boost Technology
6.4Thermal Considerations
Intel Turbo Boost Technology allows processor cores and Processor Graphics cores to
run faster than the baseline frequency. During a turbo event, the processor can exceed
its TDP power for brief periods. Turbo is invoked opportunistically and automatically as
long as the processor is conforming to its temperature, power delivery, and current
specification limits. Thus, thermal solutions and platform cooling that are designed to
be less than thermal design guidance may experience thermal and performance issues
since more applications will tend to run at or near the maximum power limit for
significant periods of time.
6.4.1Intel® Turbo Boost Technology Power Control and
Reporting
When operating in the turbo mode, the processor will monitor its own power and adjust
the turbo frequency to maintain the average power within limits over a thermally
significant time period. The package, processor core, and graphic core powers are
estimated using architectural counters and do not rely on any input from the platform.
The behavior of turbo is dictated by the following controls that are accessible using
MSR, MMIO, or PECI interfaces:
• POWER_LIMIT_1: TURBO_POWER_LIMIT, MSR 610h, bits 14:0. This value sets
the exponentially weighted moving average power limit over a long time period.
This is normally aligned to the TDP of the part and steady-state cooling capability of
the thermal solution. This limit may be set lower than TDP, real-time, for specific
needs, such as responding to a thermal event. If set lower than TDP, the processor
may not be able to honor this limit for all workloads since this control only applies
in the turbo frequency range; a very high powered application may exceed
POWER_LIMIT_1, even at non-turbo frequencies. The default value is the TDP for
the SKU.
• POWER_LIMIT_1_TIME: TURBO _POWER_LIMIT, MSR 610h, bits 23:17. This
value is a time parameter that adjusts the algorithm behavior. The exponentially
weighted moving average turbo algorithm will use this parameter to maintain time
averaged power at or below POWER_LIMIT_1. The default and recommended is 1
second for desktop applications.
• POWER_LIMIT_2: TURBO_POWER_LIMIT, MSR 610h, bits 46:32. This value
establishes the upper power limit of turbo operation above TDP, primarily for
platform power supply considerations. Power may exceed this limit for up to
10 mS. The default for this limit is 1.25 x TDP.
58Thermal/Mechanical Specifications and Design Guidelines
Thermal Specifications
System Thermal Response Time
Turbo Algorithm Response Time
The following considerations and limitations apply to the power monitoring feature:
• Calibration applies to the processor family and is not conducted on a part-by-part
basis. Therefore, some difference between actual and reported power may be
observed.
• Power monitoring is calibrated with a variety of common, realistic workloads near
Tj_max. Workloads with power characteristic markedly different from those used
during the calibration process or lower temperatures may result in increased
differences between actual and estimated power.
• In the event an uncharacterized workload or power “virus” application were to
result in exceeding programmed power limits, the processor Thermal Control
Circuitry (TCC) will protect the processor when properly enabled. Adaptive Thermal
Monitor must be enabled for the processor to remain within specification.
Illustration of Intel Turbo Boost Technology power control is shown in the following
sections and figures. Multiple controls operate simultaneously allowing for
customization for multiple system thermal and power limitations. These controls allow
for turbo optimizations within system constraints.
6.4.2Package Power Control
The package power control allows for customization to implement optimal turbo within
platform power delivery and package thermal solution limitations.
Figure 6-7. Package Power Control
Thermal/Mechanical Specifications and Design Guidelines59
6.4.3Power Plane Control
The processor core and graphics core power plane controls allow for customization to
implement optimal turbo within voltage regulator thermal limitations. It is possible to
use these power plane controls to protect the voltage regulator from overheating due
to extended high currents. Power limiting per plane cannot be guaranteed below 1
second and accuracy cannot be guaranteed in all usages. This function is similar to the
package level long duration window control.
6.4.4Turbo Time Parameter
'Turbo Time Parameter' is a mathematical parameter (units in seconds) that controls
the processor turbo algorithm using an exponentially weighted moving average of
energy usage. During a maximum power turbo event of about 1.25 x TDP, the
processor could sustain Power_Limit_2 for up to approximately 1.5 the Turbo Time
Parameter. If the power value is changed during runtime, it may take a period of time
(possibly up to approximately 3 to 5 times the ‘Turbo Time Parameter’, depending on
the magnitude of the change and other factors) for the algorithm to settle at the new
control limits.
Thermal Specifications
§
60Thermal/Mechanical Specifications and Design Guidelines
PECI Interface
7PECI Interface
7.1Platform Environment Control Interface (PECI)
7.1.1Introduction
PECI uses a single wire for self-clocking and data transfer. The bus requires no
additional control lines. The physical layer is a self-clocked one-wire bus that begins
each bit with a driven, rising edge from an idle level near zero volts. The duration of the
signal driven high depends on whether the bit value is a logic ‘0’ or logic ‘1’. PECI also
includes variable data transfer rate established with every message. In this way, it is
highly flexible even though underlying logic is simple.
The interface design was optimized for interfacing to Intel processors in both single
processor and multiple processor environments. The single wire interface provides low
board routing overhead for the multiple load connections in the congested routing area
near the processor and chipset components. Bus speed, error checking, and low
protocol overhead provides adequate link bandwidth and reliability to transfer critical
device operating conditions and configuration information.
The PECI bus offers:
• A wide speed range from 2 Kbps to 2 Mbps
• CRC check byte used to efficiently and atomically confirm accurate data delivery
• Synchronization at the beginning of every message minimizes device timing
accuracy requirements.
For desktop temperature monitoring and fan speed control management purposes, the
PECI 3.0 commands that are commonly implemented includes Ping(), GetDIB(),
GetTemp(), T
be implemented by utilizing the RdPkgConfig() command.
CONTROL
and TjMax(TCC) read. The T
CONTROL
7.1.1.1Fan Speed Control with Digital Thermal Sensor
Processor fan speed control is managed by comparing DTS temperature data against
the processor-specific value stored in the static variable, T
temperature data is less than T
speed of the thermal solution fan. This remains the same as with the previous guidance
for fan speed control. Please refer to Section 6.1.3 for guidance where the DTS
temperature data exceeds T
The DTS temperature data is delivered over PECI, in response to a GetTemp()
command, and reported as a relative value to TCC activation target. The temperature
data reported over PECI is always a negative value and represents a delta below the
onset of thermal control circuit (TCC) activation, as indicated by the PROCHOT# signal.
Therefore, as the temperature approaches TCC activation, the value approaches zero
degrees.
CONTROL
CONTROL
, the fan speed control algorithm can reduce the
.
and TCC read command can
CONTROL
. When the DTS
§
Thermal/Mechanical Specifications and Design Guidelines61
PECI Interface
62Thermal/Mechanical Specifications and Design Guidelines
Sensor Based Thermal Specification Design Guidance
8Sensor Based Thermal
Specification Design Guidance
The sensor based thermal specification presents opportunities for the system designer
to optimize the acoustics and simplify thermal validation. The sensor based
specification utilizes the Digital Thermal Sensor information accessed via the PECI
interface.
This chapter will review thermal solution design options, fan speed control design
guidance & implementation options and suggestions on validation both with the TTV
and the live die in a shipping system.
Note:A new fan speed control implementation scheme is called DTS 1.1 introduced in
Section 8.4.3.
8.1Sensor Based Specification Overview (DTS 1.0)
Create a thermal specification that meets the following requirements:
• Use Digital Thermal Sensor (DTS) for real-time thermal specification compliance.
• Single point of reference for thermal specification compliance over all operating
conditions.
• Does not required measuring processor power & case temperature during
functional system thermal validation.
• Opportunity for acoustic benefits for DTS values between T
Thermal specifications based on the processor case temperature have some notable
gaps to optimal acoustic design. When the ambient temperature is less than the
maximum design point, the fan speed control system (FSC) will over cool the processor.
The FSC has no feedback mechanism to detect this over cooling, this is shown in the
top half of Figure 8-1.
The sensor based specification will allow the FSC to be operated at the maximum
allowable silicon temperature or T
acoustics for operation above T
for the measured ambient. This will provide optimal
J
CONTROL
. See lower half of Figure 8-1.
CONTROL
and -1.
Thermal/Mechanical Specifications and Design Guidelines63
Sensor Based Thermal Specification Design Guidance
Power
Sensor Based Specification (DTS Temp)
TDP
Tcontrol
Ta = 30 C
-ca = 0.564
-ca = 0.448
Power
Current Specification (Case Temp)
TDP
Tcontrol
Ta = 45.1 °C
Ta = 30 °C
-ca = 0.292
Power
Sensor Based Specification (DTS Temp)
TDP
Tcontrol
Ta = 30 C
-ca = 0.564
-ca = 0.448
Power
Current Specification (Case Temp)
TDP
Tcontrol
Ta = 45.1 °C
Ta = 30 °C
-ca = 0.292
Figure 8-1. Comparison of Case Temperature versus Sensor Based Specification
64Thermal/Mechanical Specifications and Design Guidelines
Sensor Based Thermal Specification Design Guidance
TTV Thermal Profile
Y = P ower x 0.29 + 45. 1
40.0
45.0
50.0
55.0
60.0
65.0
70.0
75.0
020406080100
TTV Power (W)
TTV Case Temperature (°C)
8.2Sensor Based Thermal Specification
The sensor based thermal specification consists of two parts. The first is a thermal
profile that defines the maximum TTV T
thermal profile defines the boundary conditions for validation of the thermal solution.
as a function of TTV power dissipation. The
CASE
The second part is a defined thermal solution performance (
DTS value as reported over the PECI bus when DTS is greater than T
) as a function of the
CA
CONTROL
. This
defines the operational limits for the processor using the TTV validated thermal
solution.
8.2.1TTV Thermal Profile
For the sensor based specification, the only reference made to a case temperature
measurement is on the TTV. Functional thermal validation will not require the user to
apply a thermocouple to the processor package or measure processor power.
Note:All functional compliance testing will be based on fan speed response to the reported
DTS values above T
will be necessary.
A knowledge of the system boundary conditions is necessary to perform the heatsink
validation. Section 8.3.1 will provide more detail on defining the boundary conditions.
The TTV is placed in the socket and powered to the recommended value to simulate the
TDP condition. See Figure 8-2 for an example of the Intel
desktop processor series (Quad Core 95W) TTV thermal profile.
Figure 8-2. Intel
Thermal Profile
CONTROL
®
Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W)
. As a result, no conversion of TTV T
®
Core™ i7-2000 and i5-2000
to processor T
CASE
CASE
Note:This graph is provided as a reference, the complete thermal specification is in
Chapter 6.
Thermal/Mechanical Specifications and Design Guidelines65
Sensor Based Thermal Specification Design Guidance
0.300
0.350
0.400
0.450
0.500
0.550
0.600
0.650
0.700
DTS = TcontrolDTS = -1
TTV Theta_ca [C/W]
Ta = 40 °C
Ta = 35 °C
Ta = 30 °C
Ta = 25 °C
8.2.2Specification When DTS value is Greater than T
The product specification provides a table of CA values at DTS = T
DTS = -1 as a function of T
AMBIENT
points, a linear interpolation can be done for any DTS value reported by the processor.
A copy of the specification is provided as a reference in Tab l e 8 - 3 of Section 8.6.
The fan speed control algorithm has enough information using only the DTS value and
T
AMBIENT
to command the thermal solution to provide just enough cooling to keep the
part on the thermal profile.
As an example, the data in Tabl e 8 - 3 has been plotted in Figure 8-3 to show the
required
at 25, 30, 35 and 40°C T
CA
required CA which means lower fan speeds and reduced acoustics from the processor
thermal solution.
In the prior thermal specifications this region, DTS values greater than T
defined by the processor thermal profile. This required the user to estimate the
processor power and case temperature. Neither of these two data points are accessible
in real time for the fan speed control system. As a result, the designer had to assume
the worst case T
AMBIENT
and drive the fans to accommodate that boundary condition.
Figure 8-3. Thermal solution Performance
(inlet to heatsink). Between these two defined
AMBIENT
. The lower the ambient, the higher the
CONTROL
CONTROL
and
CONTROL
, was
TTV Ψ_ca @
TTV Ψ_ca @
8.3Thermal Solution Design Process
Thermal solution design guidance for this specification is the same as with previous
products. The initial design needs to take into account the target market and overall
product requirements for the system. This can be broken down into several steps:
66Thermal/Mechanical Specifications and Design Guidelines
• Boundary condition definition
• Thermal design / modelling
•Thermal testing.
Sensor Based Thermal Specification Design Guidance
8.3.1Boundary Condition Definition
Using the knowledge of the system boundary conditions (such as inlet air temperature,
acoustic requirements, cost, design for manufacturing, package and socket mechanical
specifications and chassis environmental test limits) the designer can make informed
thermal solution design decisions.
®
For the Intel
the thermal boundary conditions for an ATX tower system are as follows:
•T
EXTERNAL
•T
RISE
•T
AMBIENT
Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W)
= 35 °C. This is typical of a maximum system operating environment
= 5 °C. This is typical of a chassis compliant to CAG 1.1 or TAC 2.0
= 40 °C (T
AMBIENT
= T
EXTERNAL
+ T
RISE
)
Based on the system boundary conditions, the designer can select a T
to use in thermal modelling. The assumption of a T
the required
assumed T
needed to meet TTV T
CA
AMBIENT
can utilize a design with ahigher CA, which can have a lower cost.
Figure 8-4 shows a number of satisfactory solutions for the Intel® Core™ i7-2000 and
i5-2000 desktop processor series (Quad Core 95W).
Note:If the assumed T
thermal solution performance may not be sufficient to meet the product requirements.
AMBIENT
is inappropriate for the intended system environment, the
The results may be excessive noise from fans having to operate at a speed higher than
intended. In the worst case this can lead to performance loss with excessive activation
of the Thermal Control Circuit (TCC).
Figure 8-4. Example: Required CA for Various T
CASEMAX
AMBIENT
and CA
AMBIENT
has a significant impact on
AMBIENT
at TDP. A system that can deliver lower
Conditions
Note:If an ambient of greater than 45.1 °C is necessary based on the boundary conditions a
thermal solution with a
Thermal/Mechanical Specifications and Design Guidelines67
lower than 0.29 °C/W will be required.
CA
Sensor Based Thermal Specification Design Guidance
8.3.2Thermal Design and Modelling
Based on the boundary conditions, the designer can now make the design selection of
the thermal solution components. The major components that can be mixed are the
fan, fin geometry, heat pipe or air cooled solid core design. There are cost and acoustic
trade-offs the customer can make.
To aide in the design process Intel provides TTV thermal models. Please consult your
Intel Field Sales Engineer for these tools.
8.3.3Thermal Solution Validation
8.3.3.1Test for Compliance to the TTV Thermal Profile
This step is the same as previously suggested for prior products. The thermal solution
is mounted on a test fixture with the TTV and tested at the following conditions:
• TTV is powered to the TDP condition
• Thermal solution fan operating at full speedMaximum airlflow through heatsink
•T
AMBIENT
at the boundary condition from Section 8.3.1
The following data is collected: TTV power, TTV T
CASE
and T
AMBIENT
. and used to
calculate CA which is defined as:
CA = (TTV T
CASE
- T
AMBIENT
) / Power
This testing is best conducted on a bench to eliminate as many variables as possible
when assessing the thermal solution performance. The boundary condition analysis as
described in Section 8.3.1 should help in making the bench test simpler to perform.
8.3.3.2Thermal Solution Characterization for Fan Speed Control
The final step in thermal solution validation is to establish the thermal solution
performance,CA and acoustics as a function of fan speed. This data is necessary to
allow the fan speed control algorithm developer to program the device. It also is
needed to asses the expected acoustic impact of the processor thermal solution in the
system.
The characterization data should be taken over the operating range of the fan. Using
the RCBF7-1156 (DHA-A) as the example the fan is operational from 900 to 3150 RPM.
The data was collected at several points and a curve was fit to the data, see Figure 8-5.
Taking data at 6 evenly distributed fan speeds over the operating range should provide
enough data to establish an equation. By using the equation from the curve fitting, a
complete set of required fan speeds as a function of
from the reference thermal solution characterization are provided in Tabl e 8 - 3 .
The fan speed control device may modulate the thermal solution fan speed (RPM) by
one of two methods. The first and preferred is pulse width modulation (PWM) signal
compliant to the 4-Wire Pulse Width Modulation (PWM) Controlled Fans specification.
The alternative is varying the input voltage to the fan. As a result the characterization
data needs to also correlate the RPM to PWM or voltage to the thermal solution fan. The
fan speed algorithm developer needs to associate the output command from the fan
speed control device with the required thermal solution performance as stated in
Tab l e 8- 3 . Regardless of which control method is used, the term RPM will be used to
indicate required fan speed in the rest of this document.
can be developed. The results
CA
68Thermal/Mechanical Specifications and Design Guidelines
Sensor Based Thermal Specification Design Guidance
RPM vs. Measured Thermal Performance
0.300
0.350
0.400
0.450
1500
2000
2500
3000
3500
RPM
Psi-ca (°C/W)
Note:When selecting a thermal solution from a thermal vendor, the characterization data
should be requested directly from them as a part of their thermal solution collateral.
Figure 8-5. Thermal Solution Performance versus Fan Speed
Note:This data is taken from the preliminary evaluation of the validation of the RCBF7-1156
(DHA-A) reference processor thermal solution. The
Ta b le 8 - 3 at the end of this chapter.
versus RPM data is available in
CA
8.4Fan Speed Control (FSC) Design Process
The next step is to incorporate the thermal solution characterization data into the
algorithms for the device controlling the fans.
As a reminder the requirements are:
• When the DTS value is at or below T
with prior processors.
•When DTS is above T
CA versus RPM to achieve the necessary level of cooling.
DTS 1.1 provides another option to do fan speed control without the Tambient data.
Please refer to Section 8.4.3 for more details.This chapter will discuss two
implementations. The first is a FSC system that is not provided the T
information and a FSC system that is provided data on the current T
method will result in a thermally compliant solution and some acoustic benefit by
operating the processor closer to the thermal profile. But only the T
system can fully utilize the specification for optimized acoustic performance.
In the development of the FSC algorithm it should be noted that the T
expected to change at a significantly slower rate than the DTS value. The DTS value will
be driven by the workload on the processor and the thermal solution will be required to
respond to this much more rapidly than the changes in T
CONTROL
CONTROL
, FSC algorithms will use knowledge of T
, the fans can be slowed down - just as
and
. Either
aware FSC
is
AMBIENT
AMBIENT
AMBIENT
AMBIENT
AMBIENT
AMBIENT
.
Thermal/Mechanical Specifications and Design Guidelines69
Sensor Based Thermal Specification Design Guidance
An additional consideration in establishing the fan speed curves is to account for the
thermal interface material performance degradation over time.
8.4.1Fan Speed Control Algorithm without T
In a system that does not provide the FSC algorithm with the T
designer must make the following assumption:
• When the DTS value is greater than T
CONTROL
derived in Section 8.3.1.
This is consistent past FSC guidance from Intel, to accelerate the fan to full speed when
the DTS value is greater than T
specification at DTS = T
CONTROL
CONTROL
can reduce some of the over cooling of the processor
. As will be shown below, the DTS thermal
and provide an acoustic noise reduction from the processor thermal solution.
In this example the following assumptions are made:
•T
AMBIENT
= 40 °C
• Thermal Solution designed / validated to a 40 °C environment
For a processor specification based on a T
equal to or greater than T
the fan speed is slowed down as in prior products
CASE
CONTROL
, the fan speed must be accelerated to full speed. For
the reference thermal solution, full speed is 3150 RPM (dashed line in Figure 8-6). The
DTS thermal specification defines a required
RPM. This is much less than full speed even when assuming the T
line in Figure 8-6). The shaded area displayed in Figure 8-6 is where DTS values are
less than T
CONTROL
. For simplicity, the graph shows a linear acceleration of the fans
from
T
CONTROL
- 10 to T
CONTROL
as has been Intel’s guidance for simple fan speed control
algorithms.
, the T
AMBIENT
thermal profile, when the DTS value is
at T
CA
CONTROL
AMBIENT
Data
information, the
AMBIENT
is at boundary condition
and the fan speed is 2300
AMBIENT
= 40 °C (solid
As the processor workload continues to increase, the DTS value will increase and the
FSC algorithm will linearly increase the fan speed from the 2300 RPM at DTS = -20 to
full speed at DTS value = -1.
70Thermal/Mechanical Specifications and Design Guidelines
Sensor Based Thermal Specification Design Guidance
Figure 8-6. Fan Response Without T
AMBIENT
Data
8.4.2Fan Speed Control Algorithm with T
In a system where the FSC algorithm has access to the T
capable of using the data the benefits of the DTS thermal specification become more
striking.
AMBIENT
AMBIENT
Data
information and is
As will be demonstrated below, there is still over cooling of the processor, even when
compared to a nominally ambient aware thermal solution equipped with a thermistor.
An example of these thermal solutions are the RCFH7-1156 (DHA-A) or the boxed
processor thermal solutions. This over cooling translates into acoustic margin that can
be used in the overall system acoustic budget.
In this example the following assumptions are made:
•T
AMBIENT
= 35 °C
• The same Thermal Solution designed / validated to a 40 °C environment as used in
the example in Section 8.4.1
For a processor specification based on a T
equal to or greater than T
for the T
AMBIENT
the fan speed is slowed down as in prior products
thermal profile, when the DTS value is
CASE
CONTROL
, the fan speed is accelerated to maximum fan speed
as controlled by the thermistor in thermal solution. For the RCFH71156 (DHA-A), this would be about 2150 RPM at 35 °C. This is graphically displayed as
the dashed line in Figure 8-7.
Thermal/Mechanical Specifications and Design Guidelines71
Sensor Based Thermal Specification Design Guidance
This is an improvement over the ambient unaware system but is not fully optimized for
acoustic benefit. The DTS thermal specification required CA and therefore the fan
speed in this scenario is 1500 RPM. This is less than thermistor controlled speed of
2150 RPM - even if the assumption is a T
AMBIENT
= 35 °C. This is graphically displayed
in Figure 8-7.
The shaded area displayed in Figure 8-7 is where DTS values are less than T
For simplicity the graph shows a linear acceleration of the fans from T
T
CONTROL
as has been Intel’s guidance for simple fan speed control algorithms.
As the processor workload continues to increase, the DTS value will increase and the
FSC algorithm will linearly increase the fan speed from the 1500 RPM at DTS = -20 to
2150 RPM at DTS value = -1.
Figure 8-7. Fan Response with T
AMBIENT
Aware FSC
CONTROL
CONTROL
- 10 to
.
72Thermal/Mechanical Specifications and Design Guidelines
Sensor Based Thermal Specification Design Guidance
8.4.3DTS 1.1 A New Fan Speed Control Algorithm without
T
AMBIENT
In most system designs incorporating processor ambient inlet data in fan speed control
adds design and validation complexity with a possible BOM cost impact to the system.
A new fan speed control methodology is introduced to improve system acoustics
without needing the processor inlet ambient information.
Data
The DTS 1.1 implementation consists of two parts, a
a
point at DTS = -1.
CA
The
point at DTS = -1 defines the minimum CA required at TDP considering the
CA
requirement at T
CA
CONTROL
and
worst case system design Tambient design point:
CA = (T
CASE_max
- T
Ambient target
) / TDP
For example, for a 95 TDP part, the Tcase max is 72.6C and at a worst case design
point of 40C local ambient this will result in
CA = (72.6 - 40) / 95 = 0.34 C/W
Similarly for a system with a design target of 45 C ambient the
at DTS = -1 needed
CA
will be 0.29 C/W.
The second point defines the thermal solution performance (
Ta b le 8 - 1 lists the required
for various TDP processors.
CA
CA
) at T
CONTROL
.
These two points define the operational limits for the processor for DTS 1.1
implementation. At T
is better than or equivalent to the required CA listed in Tab l e 8 - 1. Similarly the fan
CA
CONTROL
the fan speed must be programed such that the resulting
speed should be set at DTS = -1 such that the thermal solution performance is better
than or equivalent to the
requirements at Tambient_Max. Based on the processor
CA
temperature, the fan speed controller must linearly change the fan speed from DTS =
T
CONTROL
to DTS = -1 between these points. Figure 8-8 gives a visual description on
DTS 1.1.
Thermal/Mechanical Specifications and Design Guidelines73
Figure 8-8. DTS 1.1 Definition Points
Sensor Based Thermal Specification Design Guidance
Table 8-1.DTS 1.1 Thermal Solution Performance above T
at
CA
at
Processor TDP
DTS = T
CA
CONTROL
1,2
95W0.5640.3430.2910.238
65W0.7550.4480.3710.294
45W1.1650.6620.5510.440
35W1.3610.7140.5710.429
Notes:
Notes:
1.
2.Example, For A Chassis Trise assumption of 12 C for a 95W TDP processor.
at “DTS = T
CA
cooling fan inlet) of less than 10 C. In case your expected Trise is grater than 10 C a correction factor
should be used as explained below. For each 1 deg C Trise above 10C, the correction factor CF is defined as
CF= 1.7 / Processor_TDP.
CF = 1.7/95W = 0.018/C
For Trise > 10 C
CA at Tcontrol = Value listed in Column_2 - (Trise - 10) * CF
CA = 0564 - (12 - 10) * 0.018 =0.528 C/W
In this case the fan speed should be set slightly higher equivalent to YCA=0.528C/W
” is applicable to systems that has Internal Trise (Troom temperature to Processor
control
DTS = -1
At System
ambient_max=
40C
CONTROL
at
CA
DTS = -1
At System
ambient_max =
45C
at
CA
DTS = -1
At System
ambient_max =
50C
74Thermal/Mechanical Specifications and Design Guidelines
Sensor Based Thermal Specification Design Guidance
8.4.4Fan Speed Control Implementation Details
Most fan controllers allow programming a few “temperature versus PWM” or
“temperature v.s RPM” points for fan speed control and do a linear interpolation
between the points. Using Ta b le 8 - 1 determine the
at DTS = -1. From the thermal solution performance characteristics (RPM versus
find equivalent RPM and PWM. Tab l e 8 - 2 give an example of how a fan speed control
table may look like for processor cooling needs. DTS 1.1 only specify the thermal
performance needed at T
CONTROL
and at DTS = -1. All the other points can be defined
as needed based on rest of the platform cooling needs.
requirements at T
CA
CONTROL
and
CA)
Table 8-2.Fan Speed control example for 95W TDP processor
DTS values
DTS = -5940C...20%1000
DTS = -3960C...30%1050
...............
...............
DTS = -2079C0.56440%1100
DTS = -198C0.343100%3150
Calculated Tj
(assuming
TjMax = 99C)
CA
Example PWM%Example RPM
Notes:
1.This table is for illustration purposes only. PWM% and RPM numbers will vary based on system thermal
solution for the required
targets.
CA
For a typical chassis that has Trise lower than 10C, based on the reference thermal
solution data, a fan speed of 1050 RPM will give the needed CA at T
maximum fan speed of 3150 RPM will be programmed for DTS = -1. As the processor
workload continues to increase the DTS value will increase and the FSC algorithm will
linearly increase the fan speed from the 1050 RPM at DTS = -20 to fans full speed at
DTS = -1.
Figure 8-9 shows a comparison chart from this tool for various fan speed control
options including DTS 1.1.
In this example the following assumptions are made:
•Operating T
AMBIENT
= 35 °C
• Thermal Solution designed / validated to a 40 °C ambient max as used in the
example in Section 8.4.1 Reference processor thermal solution (RCFH7-1156
(DHA-A))
•T
CONTROL
• For DTS 1.0 the FSC device has access to T
•Below T
= -20
CONTROL
AMBIENT
data
the fan speed is slowed down to minimum as in prior products
• Power = 75W with all cores active
1
CONTROL
. A
Thermal/Mechanical Specifications and Design Guidelines75
Sensor Based Thermal Specification Design Guidance
In Figure 8-9, the red line represents the DTS 1.1 fan speed control implementation. At
75W the fans will be ~ 1600 RPM keeping the Tj at ~ 89C. Blue line represent DTS 1.0
with ambient sensor. The fans with DTS 1.0 will be roughly at the same speed
~ 1650 RPM resulting in Tj at ~ 88 C. The Golden line represents the fan speed control
option where fan ramps to keep the Tj at T
CONTROL
case with overcooling to CPU to Tj of ~ 81 C. Below T
. Fan will be running full speed in this
CONTROL
, the designer can set the
fan speed to minimum or as desired by other system cooling needs.
Figure 8-9. Fan Response Comparison with Various Fan Speed Control Options
Notes:
1.Tj is the CPU temperatuers and can be calulated from relative DTS value (PECI) and TjMax register.
Tj = DTS + TjMax(register)
8.5System Validation
System validation should focus on ensuring the fan speed control algorithm is
responding appropriately to the DTS values and T
AMBIENT
well as any other device being monitored for thermal compliance.
Since the processor thermal solution has already been validated using the TTV to the
thermal specifications at the predicted T
AMBIENT
, additional TTV based testing in the
chassis is not necessary.
Once the heatsink has been demonstrated to meet the TTV Thermal Profile, it should be
evaluated on a functional system at the boundary conditions.
76Thermal/Mechanical Specifications and Design Guidelines
data in the case of DTS 1.0 as
Sensor Based Thermal Specification Design Guidance
In the system under test and Power/Thermal Utility Software set to dissipate the TDP
workload confirm the following item:
• Verify if there is TCC activity by instrumenting the PROCHOT# signal from the
processor. TCC activation in functional application testing is unlikely with a
compliant thermal solution. Some very high power applications might activate TCC
for short intervals this is normal.
• Verify fan speed response is within expectations - actual RPM (
with DTS temperature and T
• Verify RPM versus PWM command (or voltage) output from the FSC device is within
expectations.
• Perform sensitivity analysis to asses impact on processor thermal solution
performance and acoustics for the following:
— Other fans in the system.
— Other thermal loads in the system.
In the same system under test, run real applications that are representative of the
expected end user usage model and verify the following:
• Verify fan speed response versus expectations as done using Power/Thermal Utility
SW.
• Validate system boundary condition assumptions: Trise, venting locations, other
thermal loads and adjust models / design as required.
AMBIENT
) is consistent
CA
.
8.6Thermal Solution Characterization
Ta b le 8 - 3 is early engineering data on the RCBF7-1156 (DHA-A) thermal solution as a
reference for the development of thermal solutions and the fan speed control
algorithm.
Table 8-3.Thermal Solution Performance above T
DTS = T
CA
CONTROL
T
1
AMBIENT
45.10.290N/A0.290N/A
44.00.310N/A0.301N/A
43.00.328N/A0.312N/A
42.00.34629500.322N/A
41.00.36426000.333N/A
40.00.38323000.3433150
39.00.40121000.3542750
38.00.41919000.3642600
37.00.43717500.3752400
36.00.45516500.3852250
35.00.47315000.3962150
34.00.49114000.4062050
33.00.51013500.4171900
32.00.52812000.4271850
31.00.54611500.4381750
30.00.56410500.4481650
29.00.58210000.4591600
at
2
DTS = T
RPM for CA at
CONTROL
CONTROL
(Sheet 1 of 2)
5
CA
DTS = -1
at
3
RPM for CA at
DTS = -1
5
Thermal/Mechanical Specifications and Design Guidelines77
Sensor Based Thermal Specification Design Guidance
Table 8-3.Thermal Solution Performance above T
T
AMBIENT
DTS = T
CA
CONTROL
1
at
RPM for CA at
2
DTS = T
CONTROL
28.00.60010000.4691550
27.00.61810000.4801450
26.00.63710000.4911400
25.00.65510000.5011350
24.00.67310000.5121300
23.00.69110000.5221250
22.00.70910000.5331200
21.00.72710000.5431150
20.00.74610000.5541100
Notes:
1.The ambient temperature is measured at the inlet to the processor thermal solution
2.This column can be expressed as a function of T
3.This column can be expressed as a function of T
4.This table is provided as a reference please consult the product specification for current values.
5.Based on the testing performed a curve was fit to the data in the form
6.Full Speed of 3150 RPM the DHA-A thermal solution delivers a
7.Minimum speed is limited to 1000 RPM to ensure cooling of other system components
= 0.29 + (45.1 - T
CA
= 0.29 + (45.1 - T
CA
3
Psi_ca = a x RPM
a = -1.53 E-11, b = 1.41 E-07, c = -0.00048, d = 0.925782
+b x RPM2+c x RPM + d, where:
AMBIENT
AMBIENT
) x 0.0181
) x 0.0105
testing.
AMBIENT
AMBIENT
CONTROL
(Sheet 2 of 2)
5
DTS = -1
by the following equation:
by the following equation:
= 0.335 °C /W based on preliminary
CA
§
CA
at
3
RPM for CA at
DTS = -1
5
78Thermal/Mechanical Specifications and Design Guidelines
ATX Reference Thermal Solution
9ATX Reference Thermal
Solution
Note:The reference thermal mechanical solution information shown in this document
represents the current state of the data and may be subject to modification.The
information represents design targets, not commitments by Intel.
The design strategy is to use the design concepts from the prior Intel
Bifurcated Fin Heatsink Reference Design (Intel® RCBFH Reference Design) designed
®
originally for the Intel
Pentium® 4 processors.
This chapter describes the overall requirements for the ATX heatsink reference thermal
solution supporting the processors including critical-to-function dimensions, operating
environment, and validation criteria.
9.1Heatsink Thermal Solution
The reference thermal solutions are active fan solution similar to the prior designs for
the Intel® Pentium® 4 and Intel® Core™2 Duo processors. There are two designs being
enabled. The first is called RCFH7-1156 (DHA-A) which is a universal design supporting
the Intel
second is called the RCFH6-1156 (DHA-B) which only supports the Intel® Core™ i72000 and i5-2000 desktop processor series (Quad Core 65W) and Intel® Core™ i32000 desktop processor series (Dual Core 65W).
Table 9-1.Reference Thermal Solutions
®
Core™ i7-2000 and i5-2000 desktop processor series (Quad Core 95W). The
®
Radial Curved
Thermal Solution NameProcessor
®
Intel
RCFH7-1156 (DHA-A)
RCFH6-1156 (DHA-B)
Core™ i7-2000 and i5-2000 desktop
processor series (Quad Core 95W)
®
Intel
Core™ i7-2000 and i5-2000 desktop
processor series (Quad Core 65W)
®
Core™ i3-2000 desktop processor
Intel
series (Dual Core 65W)
The two solutions are very similar. They both use an approximately 25 mm (1 inch) tall
aluminum extrusion, integrated fan and molded plastic housing. The notable difference
is the RCFH7-1156 has copper core to support the higher TDP as compared to the
aluminum core of the RCFH6-1156. Theses designs integrate the metal clip used in
prior reference designs into a molded assembly that includes the fan motor housing
and wire guard. Figure 9-1 shows the reference thermal solution assembly. The heat
sink attaches to the motherboard with the push pin fastener design from previous
reference designs, see Figure B-6 through Figure B-9 for details on the push pin
fastener design.
Thermal/Mechanical Specifications and Design Guidelines79
80Thermal/Mechanical Specifications and Design Guidelines
ATX Reference Thermal Solution
27.00mm Maximum
Component Height(3 places)
10.10mm MaximumComponent Height(5 places)
2.07mm MaximumComponent Height(1 place)
1.20mm Maximum
Component Height
(1 place)
2.50mm Maximum
Component Height
(6 places)
26. 00m m Ma xi m u m
Component Height(3 places)
1.6 mmMaximumComponent Height(2 places)
27.00mm Maximum
Component Hei gh t
(3 places)
10.10m m Maximum
Component Height
(5 places)
2.07mm Maximum
Component Height
(1 place)
1.20mm Maximum
Component Height
(1 place)
2.50mm Maximum
Component Height
(6 places)
26. 00m m Ma xi m u m
Component Heigh t
(3 places)
1.6 mm Maximum
Component Height
(2 places)
9.2Geometric Envelope for the Intel Reference ATX
Thermal Mechanical Design
Figure 9-2 shows a 3-D representation of the board component keep out for the
reference ATX thermal solution. A fully dimensioned drawing of the keep-out
information is available at Figure B-1 and Figure B-2 in Appendix B. A PDF version of
these drawings is available as well as a 3-D IGES model of the board level keep out
zone is available. Contact your field sales representative for these documents.
Figure 9-2. ATX KOZ 3-D Model Primary (Top) Side
Note: All Maximum Component Heights are post reflow / assembly
Note:The maximum height of the reference thermal solution (in Figure 9-2) above the
motherboard is 46.00 mm [1.81 inches], and is compliant with the motherboard
primary side height constraints defined in the ATX Specification and the microATX Motherboard Interface Specification found at http://www.formfactors.org.
The reference solution requires a chassis obstruction height of at least 81.30 mm
[3.20 inches], measured from the top of the motherboard. This allows for appropriate
fan inlet airflow to ensure fan performance, and therefore overall cooling solution
performance. This is compliant with the recommendations found in both ATX Specification and microATX Motherboard Interface Specification documents.
Thermal/Mechanical Specifications and Design Guidelines81
9.3Reference Design Components
9.3.1Extrusion
The aluminum extrusion design is similar to what is shown in Figure 9-3. To facilitate
reuse of the core design, the center cylinder ID and wall thickness are the same as
RCBFH3.
Figure 9-3. RCBFH Extrusion
ATX Reference Thermal Solution
9.3.2Clip
This clip design is intended to adapt previous thermal solutions such as the RCBFH3 to
comply with the mechanical and structural requirements for the LGA1155 socket.
Structural design strategy for the clip is to provide sufficient load for the Thermal
Interface Material (TIM). The clip does not have to provide additional load for socket
solder joint protect.
The clip is formed from 1.6 mm carbon steel, the same material as used in previous clip
designs. The target metal clip nominal stiffness is 493 N/mm [2813 lb/in]. The
combined target for reference clip and fasteners nominal stiffness is 311 N/mm
[1778 lb/in]. The nominal preload provided by the reference design is 175.7 ± 46.7 N
[39.5 lb ±10.5 lbf].
Note:An updated clip drawing and IGES file is available please order 2009 Reference Thermal
Solution Clip Mechanical Models and Mechanical Drawings to support power on with
existing thermal solutions.
Note:Intel reserves the right to make changes and modifications to the design as necessary
to the reference design, in particular the clip.
82Thermal/Mechanical Specifications and Design Guidelines
ATX Reference Thermal Solution
Figure 9-4. Clip for Existing Solutions to straddle LGA1155 Socket
9.3.3Core
The core is the same forged design used in previous reference designs. This allows the
reuse of the fan attach and if desired the same extrusion from existing designs. The
machined flange height will be determined in the preliminary design review to match
the IHS height for the processors when installed in the LGA1155. The final height of the
flange will be an output of the design validation and could be varied to adjust the
preload. See Section 9.4 for additional information on the critical to function interfaces
between the core and clip.
Thermal/Mechanical Specifications and Design Guidelines83
Figure 9-5. Core
ATX Reference Thermal Solution
9.4Mechanical Interface to the Reference Attach
Mechanism
The attach mechanism component from the Intel Reference Design can be used by
other 3rd party cooling solutions. The attach mechanism consists of:
• A metal attach clip that interfaces with the heatsink core, see Figure B-10 and
Figure B-11 for the clip drawings.
• Four plastic fasteners, see Figure B-6, Figure B-7, Figure B-8 and Figure B-9 for the
component drawings.
Note:For Intel RCFH6 and RCFH7 Reference Designs, the metal attach clip is not used by the
solutions as shown in Figure 9-1. This metal attach clip design is only intended to adapt
previous thermal solutions (such as the Intel RCBFH3 Reference Design) to comply with
the mechanical and structural requirements for the LGA1155 socket.
If 3rd party cooling solutions adopt a previous thermal solutions (such as the Intel
RCBFH3 Reference Design), the reference attach mechanism (clip, core and extrusion)
portion is shown in Figure 9-6. The clip is assembled to heatsink during copper core
insertion, and is meant to be trapped between the core shoulder and the extrusion as
shown in Figure 9-7.
The critical to function mechanical interface dimensions are shown in Figure 9-7 and
Figure 9-8. Complying with the mechanical interface parameters is critical to
generating a heatsink preload compliant with the minimum preload requirement for the
selected TIM and to not exceed the socket design limits.
84Thermal/Mechanical Specifications and Design Guidelines
ATX Reference Thermal Solution
Core shouldertraps clip in place
Core shoulder
traps clip in place
Clip
Core
Fin Array
Fan
Clip
See Detail A
Core
Fin Array
Fan
Clip
See Detail A
Detail A
Fin Array
Clip
Core
1.6 mm
Detail A
Fin Array
Clip
Core
1.6 mm
Detail A
Fin Array
Clip
Core
1.6 mm
Detail A
Fin Array
Clip
Core
1.6 mm
Detail A
Fin Array
Clip
Core
1.6 mm
Detail A
Fin Array
Clip
Core
1.6 mm
Figure 9-6. Clip Core and Extrusion Assembly
Figure 9-7. Critical Parameters for Interface to the Reference Clip
Thermal/Mechanical Specifications and Design Guidelines85
Figure 9-8. Critical Core Dimensions
R 0.40 mm max
R 0.40 mm max
Gap required to avoid
core surface blemish
during clip assembly.
Recommend 0.3 mm min.
1.00 mm min
1.00 +/- 0.10 mm
Core
2.45 +/- 0.10 mm
Dia 38.68 +/- 0.30mm
Dia 36.14 +/- 0.10 mm
ATX Reference Thermal Solution
9.5Heatsink Mass & Center of Gravity
• Total mass including plastic fan housing and fasteners <500 g.
• Assembly center of gravity <= 25.4 mm, measured from the top of the IHS.
9.6Thermal Interface Material
A thermal interface material (TIM) provides conductivity between the IHS and heat
sink. The designs use Dow Corning TC-1996. The TIM application is 0.14 g, which will
be a nominal 20 mm diameter (~0.79 inches).
86Thermal/Mechanical Specifications and Design Guidelines
ATX Reference Thermal Solution
Die Centerline
Package Centerline
Drawing Not to Scale
All Dimensions in mm
37.5
37.5
10.94
10.94
9.7Heat Pipe Thermal Considerations
The following drawing shows the orientation and position of the 1155-land LGA Package
TTV die, this is the same package layout as used in the 1156-land LGA Package TTV.
The TTV die is sized and positioned similar to the production die.
Figure 9-9. TTV Die Size and Orientation
Thermal/Mechanical Specifications and Design Guidelines87
§§
ATX Reference Thermal Solution
88Thermal/Mechanical Specifications and Design Guidelines
Thermal Solution Quality and Reliability Requirements
10Thermal Solution Quality and
Reliability Requirements
10.1Reference Heatsink Thermal Verification
Each motherboard, heatsink and attach combination may vary the mechanical loading
of the component. Based on the end user environment, the user should define the
appropriate reliability test criteria and carefully evaluate the completed assembly prior
to use in high volume. The Intel reference thermal solution will be evaluated to the
boundary conditions in Chapter 5.
The test results, for a number of samples, are reported in terms of a worst-case mean
+ 3 value for thermal characterization parameter using the TTV.
10.2Mechanical Environmental Testing
Each motherboard, heatsink and attach combination may vary the mechanical loading
of the component. Based on the end user environment, the user should define the
appropriate reliability test criteria and carefully evaluate the completed assembly prior
to use in high volume. Some general recommendations are shown in Ta b l e 1 0 - 1.
The Intel reference heatsinks will be tested in an assembled to the LGA1155 socket and
mechanical test package. Details of the Environmental Requirements, and associated
stress tests, can be found in Tab l e 1 0 -1 are based on speculative use condition
assumptions, and are provided as examples only.
Table 10-1. Use Conditions (Board Level)
1
Test
Mechanical Shock3 drops each for + and - directions in each of 3
Random VibrationDuration: 10 min/axis, 3 axes
Notes:
1.It is recommended that the above tests be performed on a sample size of at least ten assemblies from
multiple lots of material.
2.Additional pass/fail criteria may be added at the discretion of the user.
perpendicular axes (that is, total 18 drops)
Profile: 50 g, Trapezoidal waveform, 4.3 m/s [170 in/s]
minimum velocity change
Frequency Range: 5 Hz to 500 Hz
5 Hz @ 0.01 g
20 Hz to 500 Hz @ 0.02 g
Power Spectral Density (PSD) Profile: 3.13 g RMS
2
RequirementPass/Fail Criteria
Visual Check and
Electrical Functional
Test
Visual Check and
Electrical Functional
/Hz to 20 Hz @ 0.02 g2/Hz (slope up)
2
/Hz (flat)
Test
2
Thermal/Mechanical Specifications and Design Guidelines89
Thermal Solution Quality and Reliability Requirements
10.2.1Recommended Test Sequence
Each test sequence should start with components (that is, baseboard, heatsink
assembly, and so on) that have not been previously submitted to any reliability testing.
Prior to the mechanical shock & vibration test, the units under test should be
preconditioned for 72 hours at 45 ºC. The purpose is to account for load relaxation
during burn-in stage.
The test sequence should always start with a visual inspection after assembly, and
BIOS/Processor/memory test. The stress test should be then followed by a visual
inspection and then BIOS/Processor/memory test.
10.2.2Post-Test Pass Criteria
The post-test pass criteria are:
1. No significant physical damage to the heatsink and retention hardware.
2. Heatsink remains seated and its bottom remains mated flatly against the IHS
surface. No visible gap between the heatsink base and processor IHS. No visible tilt
of the heatsink with respect to the retention hardware.
3. No signs of physical damage on baseboard surface due to impact of heatsink.
4. No visible physical damage to the processor package.
5. Successful BIOS/Processor/memory test of post-test samples.
6. Thermal compliance testing to demonstrate that the case temperature specification
can be met.
10.2.3Recommended BIOS/Processor/Memory Test Procedures
This test is to ensure proper operation of the product before and after environmental
stresses, with the thermal mechanical enabling components assembled. The test shall
be conducted on a fully operational baseboard that has not been exposed to any
battery of tests prior to the test being considered.
Testing setup should include the following components, properly assembled and/or
connected:
• Appropriate system baseboard.
• Processor and memory.
• All enabling components, including socket and thermal solution parts.
The pass criterion is that the system under test shall successfully complete the
checking of BIOS, basic processor functions and memory, without any errors. Intel PC Diags is an example of software that can be utilized for this test.
90Thermal/Mechanical Specifications and Design Guidelines
Thermal Solution Quality and Reliability Requirements
10.3Material and Recycling Requirements
Material shall be resistant to fungal growth. Examples of non-resistant materials
include cellulose materials, animal and vegetable based adhesives, grease, oils, and
many hydrocarbons. Synthetic materials such as PVC formulations, certain
polyurethane compositions (such as polyester and some polyethers), plastics which
contain organic fillers of laminating materials, paints, and varnishes also are
susceptible to fungal growth. If materials are not fungal growth resistant, then MILSTD-810E, Method 508.4 must be performed to determine material performance.
Material used shall not have deformation or degradation in a temperature life test.
Any plastic component exceeding 25 grams should be recyclable per the European Blue
Angel recycling standards.
The following definitions apply to the use of the terms lead-free, Pb-free, and RoHS
compliant.
Lead-free and Pb-free: Lead has not been intentionally added, but lead may still
exist as an impurity below 1000 ppm.
RoHS compliant: Lead and other materials banned in RoHS Directive are either
(1) below all applicable substance thresholds as proposed by the EU or (2) an
approved/pending exemption applies.
Note:RoHS implementation details are not fully defined and may change.
§
Thermal/Mechanical Specifications and Design Guidelines91
Thermal Solution Quality and Reliability Requirements
92Thermal/Mechanical Specifications and Design Guidelines
Boxed Processor Specifications
11Boxed Processor Specifications
11.1Introduction
The processor will also be offered as an Intel boxed processor. Intel boxed processors
are intended for system integrators who build systems from baseboards and standard
components. The boxed processor will be supplied with a cooling solution. This chapter
documents baseboard and system requirements for the cooling solution that will be
supplied with the boxed processor. This chapter is particularly important for OEMs that
manufacture baseboards for system integrators.
Note:Unless otherwise noted, all figures in this chapter are dimensioned in millimeters and
inches [in brackets]. Figure 11-1 shows a mechanical representation of a boxed
processor.
Note:The cooling solution that is supplied with the boxed processor will be halogen free
Note:Drawings in this chapter reflect only the specifications on the Intel boxed processor
compliant.
product. These dimensions should not be used as a generic keep-out zone for all
cooling solutions. It is the system designers’ responsibility to consider their proprietary
cooling solution when designing to the required keep-out zone on their system
platforms and chassis. Refer to the Appendix B for further guidance on keep in and
keep out zones.
Thermal/Mechanical Specifications and Design Guidelines93
Figure 11-1. Mechanical Representation of the Boxed Processor
Boxed Processor Specifications
Note: The airflow of the fan heatsink is into the center and out of the sides of the fan heatsink.
11.2Mechanical Specifications
11.2.1Boxed Processor Cooling Solution Dimensions
This section documents the mechanical specifications of the boxed processor. The
boxed processor will be shipped with an unattached fan heatsink. Figure 11-1 shows a
mechanical representation of the boxed processor.
Clearance is required around the fan heatsink to ensure unimpeded airflow for proper
cooling. The physical space requirements and dimensions for the boxed processor with
assembled fan heatsink are shown in Figure 11-2 (Side View), and Figure 11-3 (Top
View). The airspace requirements for the boxed processor fan heatsink must also be
incorporated into new baseboard and system designs. Airspace requirements are
shown in Figure 11-7 and Figure 11-8. Note that some figures have centerlines shown
(marked with alphabetic designations) to clarify relative dimensioning.
94Thermal/Mechanical Specifications and Design Guidelines
Boxed Processor Specifications
Figure 11-2. Space Requirements for the Boxed Processor (side view)
Figure 11-3. Space Requirements for the Boxed Processor (top view)
Note: Diagram does not show the attached hardware for the clip design and is provided only as a mechanical
representation.
Thermal/Mechanical Specifications and Design Guidelines95
Boxed Processor Specifications
Figure 11-4. Space Requirements for the Boxed Processor (overall view)
11.2.2Boxed Processor Fan Heatsink Weight
The boxed processor fan heatsink will not weigh more than 450 grams.
11.2.3Boxed Processor Retention Mechanism and Heatsink
Attach Clip Assembly
The boxed processor thermal solution requires a heatsink attach clip assembly, to
secure the processor and fan heatsink in the baseboard socket. The boxed processor
will ship with the heatsink attach clip assembly.
11.3Electrical Requirements
11.3.1Fan Heatsink Power Supply
The boxed processor's fan heatsink requires a +12 V power supply. A fan power cable
will be shipped with the boxed processor to draw power from a power header on the
baseboard. The power cable connector and pinout are shown in Figure 11-5.
96Thermal/Mechanical Specifications and Design Guidelines
Boxed Processor Specifications
NOTES:
Pin
Signal
12
34
1
2
3
4
GND
+12 V
SENSE
CONTROL
Straight square pin, 4-pin terminal housing with
polarizing ribs and friction locking ramp.
0.100" pitch, 0.025" square pin widt h.
Match with straight pin, friction lock header on
mainboard.
Baseboards must provide a matched power header to support the boxed processor.
Table 11-1 contains specifications for the input and output signals at the fan heatsink
connector.
The fan heatsink outputs a SENSE signal, which is an open- collector output that pulses
at a rate of 2 pulses per fan revolution. A baseboard pull-up resistor provides VOH to
match the system board-mounted fan speed monitor requirements, if applicable. Use of
the SENSE signal is optional. If the SENSE signal is not used, pin 3 of the connector
should be tied to GND.
The fan heatsink receives a PWM signal from the motherboard from the 4th pin of the
connector labeled as CONTROL.
The boxed processor's fan heatsink requires a constant +12 V supplied to pin 2 and
does not support variable voltage control or 3-pin PWM control.
The power header on the baseboard must be positioned to allow the fan heatsink power
cable to reach it. The power header identification and location should be documented in
the platform documentation, or on the system board itself. Figure 11-6 shows the
location of the fan power connector relative to the processor socket. The baseboard
power header should be positioned within 110 mm [4.33 inches] from the center of the
processor socket.
Figure 11-5. Boxed Processor Fan Heatsink Power Cable Connector Description
Table 11-1. Fan Heatsink Power and Signal Specifications
DescriptionMinTypMaxUnitNotes
+12V: 12 volt fan power supply11.412.012.6V—
IC:
• Maximum fan steady-state current draw
• Average steady-state fan current draw
• Maximum fan start-up current draw
• Fan start-up current draw maximum duration
SENSE: SENSE frequency—2—pulses per fan
CONTROL212528kHz
—
—
—
—
1.2
0.5
2.2
1.0
—
—
—
—
A
A
A
Second
revolution
—
1
2, 3
1. Baseboard should pull this pin up to 5V with a resistor.
2. Open drain type, pulse width modulated.
3. Fan will have pull-up resistor for this signal to maximum of 5.25 V.
Thermal/Mechanical Specifications and Design Guidelines97
Boxed Processor Specifications
B
C
R110
[4.33]
Figure 11-6. Baseboard Power Header Placement Relative to Processor Socket
11.4Thermal Specifications
This section describes the cooling requirements of the fan heatsink solution utilized by
the boxed processor.
11.4.1Boxed Processor Cooling Requirements
The boxed processor may be directly cooled with a fan heatsink. However, meeting the
processor's temperature specification is also a function of the thermal design of the
entire system, and ultimately the responsibility of the system integrator. The processor
temperature specification is found in Chapter 6 of this document. The boxed processor
fan heatsink is able to keep the processor temperature within the specifications (see
Tab l e 6- 1 ) in chassis that provide good thermal management. For the boxed processor
fan heatsink to operate properly, it is critical that the airflow provided to the fan
heatsink is unimpeded. Airflow of the fan heatsink is into the center and out of the
sides of the fan heatsink. Airspace is required around the fan to ensure that the airflow
through the fan heatsink is not blocked. Blocking the airflow to the fan heatsink
reduces the cooling efficiency and decreases fan life. Figure 11-7 and Figure 11-8
illustrate an acceptable airspace clearance for the fan heatsink. The air temperature
entering the fan should be kept below 40 ºC. Again, meeting the processor's
temperature specification is the responsibility of the system integrator.
98Thermal/Mechanical Specifications and Design Guidelines
Thermal/Mechanical Specifications and Design Guidelines99
11.4.2Variable Speed Fan
If the boxed processor fan heatsink 4-pin connector is connected to a 3-pin
motherboard header it will operate as follows:
The boxed processor fan will operate at different speeds over a short range of internal
chassis temperatures. This allows the processor fan to operate at a lower speed and
noise level, while internal chassis temperatures are low. If internal chassis temperature
increases beyond a lower set point, the fan speed will rise linearly with the internal
temperature until the higher set point is reached. At that point, the fan speed is at its
maximum. As fan speed increases, so does fan noise levels. Systems should be
designed to provide adequate air around the boxed processor fan heatsink that remains
cooler then lower set point. These set points, represented in Figure 11-9 and
Tab l e 11 - 2, can vary by a few degrees from fan heatsink to fan heatsink. The internal
chassis temperature should be kept below 40 ºC. Meeting the processor's temperature
specification (see Chapter 6) is the responsibility of the system integrator.
The motherboard must supply a constant +12 V to the processor's power header to
ensure proper operation of the variable speed fan for the boxed processor. Refer to
Tab l e 11 - 1 for the specific requirements.
Figure 11-9. Boxed Processor Fan Heatsink Set Points
Boxed Processor Specifications
100Thermal/Mechanical Specifications and Design Guidelines
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