No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any
means, except documentation kept by the purchaser for backup purposes, without the express written
permission of ASUSTeK COMPUTER INC. (“ASUS”).
Product warranty or service will not be extended if: (1) the product is repaired, modied or altered, unless
such repair, modication of alteration is authorized in writing by ASUS; or (2) the serial number of the
product is defaced or missing.
ASUS PROVIDES THIS MANUAL “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL ASUS, ITS
DIRECTORS, OFFICERS, EMPLOYEES OR AGENTS BE LIABLE FOR ANY INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF PROFITS,
LOSS OF BUSINESS, LOSS OF USE OR DATA, INTERRUPTION OF BUSINESS AND THE LIKE),
EVEN IF ASUS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES ARISING FROM ANY
DEFECT OR ERROR IN THIS MANUAL OR PRODUCT.
SPECIFICATIONS AND INFORMATION CONTAINED IN THIS MANUAL ARE FURNISHED FOR
INFORMATIONAL USE ONLY, AND ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE,
AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY ASUS. ASUS ASSUMES NO
RESPONSIBILITY OR LIABILITY FOR ANY ERRORS OR INACCURACIES THAT MAY APPEAR IN THIS
MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
Products and corporate names appearing in this manual may or may not be registered trademarks or
copyrights of their respective companies, and are used only for identication or explanation and to the
owners’ benet, without intent to infringe.
ii
Page 3
Contents
Contents ...................................................................................................................... iii
5.1.2 Before you begin ......................................................................... 5-1
5.1.3 Installing two CrossFireX™ graphics cards ................................5-2
5.1.4 Installing the device drivers ......................................................... 5-3
5.1.5 Enabling the ATI® CrossFireX™ technology ...............................5-3
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Page 7
Notices
Federal Communications Commission Statement
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions:
• This device may not cause harmful interference, and
• This device must accept any interference received including interference that may cause
undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with manufacturer’s instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur
in a particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
The use of shielded cables for connection of the monitor to the graphics card is required
to assure compliance with FCC regulations. Changes or modications to this unit not
expressly approved by the party responsible for compliance could void the user’s authority
to operate this equipment.
Canadian Department of Communications Statement
This digital apparatus does not exceed the Class B limits for radio noise emissions from
digital apparatus set out in the Radio Interference Regulations of the Canadian Department
of Communications.
This class B digital apparatus complies with Canadian ICES-003.
REACH
Complying with the REACH (Registration, Evaluation, Authorisation, and Restriction of
Chemicals) regulatory framework, we published the chemical substances in our products at
ASUS REACH website at http://green.asus.com/english/REACH.htm.
DO NOT throw the motherboard in municipal waste. This product has been designed to
enable proper reuse of parts and recycling. This symbol of the crossed out wheeled bin
indicates that the product (electrical and electronic equipment) should not be placed in
municipal waste. Check local regulations for disposal of electronic products.
DO NOT throw the mercury-containing button cell battery in municipal waste. This symbol
of the crossed out wheeled bin indicates that the battery should not be placed in municipal
waste.
vii
Page 8
Safety information
Electrical safety
• To prevent electrical shock hazard, disconnect the power cable from the electrical outlet
before relocating the system.
• When adding or removing devices to or from the system, ensure that the power cables
for the devices are unplugged before the signal cables are connected. If possible,
disconnect all power cables from the existing system before you add a device.
• Before connecting or removing signal cables from the motherboard, ensure that all
power cables are unplugged.
• Seek professional assistance before using an adapter or extension cord. These devices
could interrupt the grounding circuit.
• Ensure that your power supply is set to the correct voltage in your area. If you are not
sure about the voltage of the electrical outlet you are using, contact your local power
company.
• If the power supply is broken, do not try to x it by yourself. Contact a qualied service
technician or your retailer.
• The optical S/PDIF is an optional component (may or may not be included in your
motherboard) and is dened as a CLASS 1 LASER PRODUCT.
INVISIBLE LASER RADIATION, AVOID EXPOSURE TO BEAM.
• Never dispose of the battery in re. It could explode and release harmful substances into
the environment.
• Never dispose of the battery with your regular household waste. Take it to a hazardous
material collection point.
• Never replace the battery with an incorrect battery type.
• RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
• DISPOSE OF USED BATTERIES ACCORDING TO THE ABOVE BATTERYRELATED INSTRUCTIONS.
Operation safety
• Before installing the motherboard and adding devices on it, carefully read all the manuals
that came with the package.
• Before using the product, ensure all cables are correctly connected and the power
cables are not damaged. If you detect any damage, contact your dealer immediately.
• To avoid short circuits, keep paper clips, screws, and staples away from connectors,
slots, sockets and circuitry.
• Avoid dust, humidity, and temperature extremes. Do not place the product in any area
where it may become wet.
This motherboard should only be used in environments with ambient temperatures between
5°C (41°F) and 40°C (104°F).
• Place the product on a stable surface.
• If you encounter technical problems with the product, contact a qualied service
technician or your retailer.
viii
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About this guide
This user guide contains the information you need when installing and conguring the motherboard.
How this guide is organized
This guide contains the following parts:
• Chapter 1: Product introduction
This chapter describes the features of the motherboard and the new technology it
supports.
• Chapter 2: Hardware information
This chapter lists the hardware setup procedures that you have to perform when
installing system components. It includes description of the switches, jumpers, and
connectors on the motherboard.
• Chapter 3: BIOS setup
This chapter tells how to change system settings through the BIOS Setup menus.
Detailed descriptions of the BIOS parameters are also provided.
• Chapter 4: Software support
This chapter describes the contents of the support DVD that comes with the
motherboard package and the software.
• Chapter 5: Multiple GPU technology support
This chapter describes how to install and congure multiple ATI® CrossFireX™
graphics cards.
Where to nd more information
Refer to the following sources for additional information and for product and software updates.
1. ASUS websites
The ASUS website provides updated information on ASUS hardware and software
products. Refer to the ASUS contact information.
2. Optional documentation
Your product package may include optional documentation, such as warranty yers,
that may have been added by your dealer. These documents are not part of the
standard package.
ix
Page 10
Conventions used in this guide
To ensure that you perform certain tasks properly, take note of the following symbols used
throughout this manual.
DANGER/WARNING: Information to prevent injury to yourself when trying to
complete a task.
CAUTION: Information to prevent damage to the components when trying to
complete a task.
IMPORTANT: Instructions that you MUST follow to complete a task.
NOTE: Tips and additional information to help you complete a task.
Typography
Bold text Indicates a menu or an item to select.
Italic
s Used to emphasize a word or a phrase.
<Key> Keys enclosed in the less-than and greater-than sign means
that you must press the enclosed key.that you must press the enclosed key.
Example: <Enter> means that you must press the Enter or
Return key.Return key.
<Key1> + <Key2> + <Key3> If you must press two or more keys simultaneously, the key
names are linked with a plus sign (+).
Example: <Ctrl> + <Alt> + <Del>
x
Page 11
P7P55D specications summary
CPU
ChipsetIntel® P55 Express Chipset
Memory
Expansion Slots
Multi-GPU Support
StorageIntel® P55 Express Chipset:
LAN
USB
IEEE 1394
Audio
ASUS Q-DesignASUS Q-Design:
LGA1156 socket for Intel® Core™ i7 Processors/
Core™ i5 processors
Supports Intel® Turbo Boost Technology
* Refer to www.asus.com for Intel CPU support list
Dual channel memory architecture
- 4 x 240-pin DIMM sockets support unbuffered non-ECC
DDR3 2133(O.C.)* / 1600 / 1333 / 1066 MHz
memeory modules
- Supports up to 16GB system memory
Supports Intel® Extreme Memory Prole (XMP)
* Hyper DIMM support is subject to the physical characteristics
of individual CPUs. Some hyper DIMMs only support one
DIMM per channel.
** Refer to www.asus.com or this user manual for the
Memory QVL (Qualied Vendors Lists)
2 x PCI Express 2.0 x 16 slots
- One slot at x16 mode (single, blue)
- One slot at x4 mode, 2.5GT/s (black)
2 x PCI Express 2.0 x1 slots (2.5GT/s)
3 x PCI slots
Supports ATI® Quad-GPU CrossFireX™ Technology
- 6 x SATA 3.0 Gb/s ports
- Intel® Matrix Storage Technology supporting SATA RAID
0,1, 5, and 10
JMicron® JMB363 SATA & PATA controller
- 1 x Ultra DMA 133/100/66 for up to 2 PATA devices
- 1 x SATA 3.0 Gb/s port (black)
- 1 x eSATA 3.0 Gb/s port (SATA on-the-go)
Realtek® 8112L Gigabit LAN controller featuring AI NET2
14 x USB 2.0 ports (6 ports at mid-board, 8 ports at rear panel)
VIA® VT6308P controller supports 2 x IEEE 1394a ports
(one at mid-board, one at rear panel)
VIA® VT1828S 8-channel High Denition Audio CODEC
- Absolute Pitch BD192/24
- DTS Surround Sensation UltraPC
- BD audio layer Content Protection
- Supports Jack-Detection, Multi-streaming,
and Front Panel Jack-Retasking
- Optical S/PDIF out port at back I/O
- ASUS Q-LED (CPU, DRAM, VGA, Boot Device LED)
- ASUS Q-Slot
- ASUS Q-DIMM
(continued on the next page)
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Page 12
P7P55D specications summary
ASUS Unique FeaturesASUS Hybrid Processor – ASUS TurboV EVO
ASUS Exclusive
Overclocking Features
Back Panel I/O Ports1 x PS/2 Keyboard port (Purple)
- Auto Tuning, TurboV, and Turbo Key
ASUS Hybrid Phase
- T.Probe Technology for Active Cooling
- 12+2 Phase Power Design
ASUS Hybrid OS – Express Gate
ASUS Xtreme Design
ASUS Exclusive Features
- MemOK!
- ASUS EPU
ASUS Quiet Thermal Solution:
- ASUS Fanless Design: Stylish Heat-sink solution
- ASUS Fanless Design: Stack Cool 3
- ASUS Fan Xpert
ASUS Crystal Sound
- ASUS Noise Filter
ASUS EZ DIY:
- ASUS Q-Shield
- ASUS Q-Connector
- ASUS O.C. Prole
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 2
- ASUS My Logo 2
- Multi-language BIOS
Precision Tweaker 2:
- vCore: Adjustable CPU voltage at 0.00625V increment
- vIMC: 49-step IMC voltage control
- vDRAM Bus: 81-step DRAM voltage control
- vPCH: 2-step chipset voltage control
- vCPU PLL: 4-step reference voltage control
SFS (Stepless Frequency Selection):
- Internal Base Clock tuning from 80MHz up to 500 MHz at
1MHz increment
- PCI Express frequency tuning from 100MHz up to 200MHz
at 1MHz increment
Overclocking Protection:
- ASUS C.P.R.(CPU Parameter Recall)
1 x PS/2 Mouse port (Green)
1 x Optical S/PDIF Out
1 x IEEE1394a
1 x eSATA 3.0 Gb/s port (SATA on-the-go)
1 x RJ45 port
8 x USB 2.0/1.1
8-channel Audio I/O
(continued on the next page)
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Page 13
P7P55D specications summary
Internal I/O Connectors
BIOS Features
ManageabilityWfM 2.0, DMI 2.0, WOL by PME, WOR by PME, PXE
Support DVD ContentsDrivers
Form FactorATX Form Factor, 12”x 9.6” (30.5cm x 24.4cm)
*Specications are subject to change without notice.
3 x USB connectors support additional 6 USB ports
1 x IDE connector
7 x SATA connectors
1 x CPU Fan connector
2 x Chassis Fan connectors (1 x 4-pin, 1 x 3-pin)
1 x Power Fan connector
1 x IEEE1394a connector
1 x COM port connector
Front panel audio connector
1 x S/PDIF Out Header
CD audio in
24-pin ATX Power connector
1 x 8-pin ATX 12V Power connectors
System Panel (Q-Connector)
1 x MemOK! button
16 Mb Flash ROM, AMI BIOS, PnP, DMI 2.0, WfM 2.0, SM BIOS
2.5, ACPI 2.0a, Multi-language BIOS, ASUS EZ Flash 2, ASUS
CrashFree BIOS 3
ASUS Utilities
ASUS Update
Anti-virus software (OEM version)
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xiv
Page 15
User Manual
Chapter 1
Chapter 1: Product introduction
1.1 Welcome!
Thank you for buying an ASUS® P7P55D motherboard!
The motherboard delivers a host of new features and latest technologies, making it another
standout in the long line of ASUS quality motherboards!
Before you start installing the motherboard, and hardware devices on it, check the items in
your package with the list below.
1.2 Package contents
Check your motherboard package for the following items.
ASUS P7P55D motherboardUser guideSupport DVD
4 x Serial ATA 3.0Gb/s cables
ASUS P7P55D
1 x Ultra DMA 133/
100/66 cable
1 x 2-in-1 ASUS Q-Connector kit
• If any of the above items is damaged or missing, contact your retailer.
• The illustrated items above are for your reference only. Actual product specications
may vary with different models.
1 x ASUS Q-Shield
1-1
Page 16
1.3 Special features
1.3.1 Product highlights
Chapter 1
Green ASUS
This motherboard and its packaging comply with the European Union’s Restriction on the
use of Hazardous Substances (RoHS). This is in line with the ASUS vision of creating
environment-friendly and recyclable products/packagings to safeguard consumers’ health
while minimizing the impact on the environment.
Intel® LGA1156 Lynneld Processor Ready
This motherboard supports the latest Intel® Lynneld processors in LGA1156 package, which
has memory and PCI Express controller integrated to support 2-channel (4 DIMMs) DDR3
memory and 16 PCI Express 2.0 lanes, providing great graphics performance. Intel® Lynneld
processor is one of the most powerful and energy efcient CPU in the world. Refer to page
2-5 for details.
Intel® P55
The Intel® P55 Express Chipset is the latest one-chipset design to support the latest 1156
socket Intel® Core™ i7 / Core™ i5 processors. Intel P55 provides improved performance by
utilizing serial point-to-point links, allowing increased bandwidth and stability.
PCIe 2.0 support
Double Speed; Double Bandwidth
This motherboard supports the latest PCIe 2.0 devices for double speed and bandwidth that
enhances system performance. Refer to page 2-22 for details.
Quad-GPU CrossFireX™ support!
Flexible Multi-GPU solution, Your Weapon of Choice!
P7P55D brings you the multi-GPU choice of CrossFireX™. The motherboard features the
most powerful Intel® P55 platform to optimize PCIe allocation in multiple GPU congurations.
Expect a brand-new gaming style you’ve never experienced before! Refer to Chapter 5 for
details.
Dual-Channel DDR3 DDR3 2133 (O.C.)/1600/1333/1066 support
The motherboard supports DDR3 memory that features data transfer rates of 2133(O.C.) /
1600 / 1333 / 1066 MHz to meet the higher bandwidth requirements of the latest 3D graphics,
multimedia, and Internet applications. The dual-channel DDR3 architecture enlarges the
bandwidth of your system memory to boost system performance. Refer to page 2-10 for
details.
1-2Chapter 1: Product Introduction
Page 17
1.3.2 ASUS Xtreme Design—Hybrid Processor
TurboV EVO
Ultimate O.C. Processor
The ultimate O.C. processor satises every level of overclockers—from die-hard enthusiasts
to beginners. Auto tuning intelligently pushes the system to the fastest clock speeds while
maintaining stability. Turbo Key boosts performance with just one touch; while TurboV offers
more options to advanced overclockers to achieve world O.C. record. Refer to page 4-9 for
details.
Auto Tuning
Auto System Level Up
Auto Tuning is an intelligent tool that automates overclocking to achieve a total system level
up. This tool also provides stability testing. Even O.C. beginners can achieve extreme yet
stable overclocking results with Auto Tuning! Refer to page 4-10 for details.
1.3.3 ASUS Xtreme Design—Hybrid Phase
T.Probe
Leading Active Cooling Technology
The T.Probe microchip detects and balances power phase loading and temperature in real-
time. This feature optimizes the power phase functions, allowing components to run at lower
temperatures and extending their lifespan.
ASUS 12+2 Phase Power Design
Unprecedented Innovation with the Best Quality Component for Best Performance
The groundbreaking 12+2 phase VRM design is brought to the ASUS motherboards. 12+2
phase power design, 12-phase for vCore and extra 2-phase for Memory controller inside
CPU can provide the highest power efciency, and hence generates less heat to effectively
enhance the overclocking capability. With the high quality power components such as low
RDS (on) MOSFETs, Ferrite core chokes with lower hysteresis loss and 100% Japan-made
high quality conductive polymer capacitors, ASUS 12+2 phase VRM design also ensure
longer component life and minimum power loss.
Chapter 1
1.3.4 ASUS Xtreme Design—Hybrid OS
ASUS Express Gate
Instant Online! Instant Fun!
Express Gate is an ASUS exclusive OS that provides you with quick access to the Internet
and key applications without entering the Windows® OS. Refer to page 3-36 and 4-7 for
details.
The actual boot time is subject to hardware congurations and product models.
ASUS P7P55D
1-3
Page 18
1.3.5 ASUS Exclusive Features
MemOK!
Chapter 1
Any Memory is A-OK!
Memory compatibility is among the top concerns during computer upgrades. Worry no more.
MemOK! is the fastest memory booting solution today. This remarkable memory rescue tool
requires nothing but a push of a button to patch memory issues and get your system up and
running in no time. The technology is able to determine failsafe settings that can dramatically
improve your system booting success. Refer to page 2-24 for details.
ASUS EPU
System Level Energy Saving
The new ASUS EPU—the world’s rst power saving engine, has been upgraded to a new 6
engine version, which provides total system power savings by detecting current PC loadings
and intelligently moderating power in real-time. With auto phase switching for components
(which includes the CPU, VGA card, memory, chipset, hard drives and CPU cooler / system
fans), the EPU automatically provides the most appropriate power usage via intelligent
acceleration and overclocking—helping save power and money. Refer to page 4-6 for details.
ASUS Quiet Thermal Solutions
ASUS Quiet Thermal solutions make the system more stable and enhances the overclocking
capability.
ASUS Fanless Design—Heat-sink solution
The heat sink design effectively directs the chipsets’ generated heat to the heatsink
near the back I/O ports, where the generated heat is carried away by the existing
airow from the CPU fan. This innovative and groundbreaking design effectively lowers
the system temperature by 10˚C, prevents any problems that are typical to standard
chipsets, and allows you to install a side-ow fan or passive cooler. The heat sink
design provides you with the most reliable fanless thermal solution.
Up to 20ºC (36ºF) Cooler—Stack Cool 3
Effective Fanless Heat Dissipation at 0dB
Stack Cool 3 is a fanless cooling solution offered exclusively by ASUS. It effectively
and noiselessly transfers heat generated by the critical components to the other side
of the specially designed PCB (printed circuit board) for effective heat dissipation—
making temperatures cooler by up to 20˚C.
Fan Xpert
Active Quiet & Cool
ASUS Fan Xpert intelligently allows users to adjust both the CPU and chassis fan
speed according to different ambient temperature, which is caused by different climate
conditions in different geographic regions and system loading. Built-in variety of useful
proles offer exible controls of fan speed to achieve a quiet and cool environment.
Refer to page 4-5 for details.
1-4Chapter 1: Product Introduction
Page 19
ASUS Crystal Sound
This feature can enhance speech-centric applications like Skype, online game, video
conference and recording.
ASUS Noise Filter
Eliminate background noise while recording
This feature detects repetitive and stationary noises like computer fans, air
conditioners, and other background noises then eliminates it in the incoming audio
stream while recording.
ASUS EZ DIY
ASUS EZ DIY feature collection provides you with easy ways to install computer components,
update the BIOS or back up your favorite settings.
ASUS Q-Design
DIY quickly, DIY easily!
ASUS Q-Design enhances your DIY experience. All of Q-LED, Q-Slot and Q-DIMM
design speed up and simplify the DIY process!
ASUS Q-Shield
Easy and Comfortable Installations
The specially designed ASUS Q-Shield does without the usual “ngers”—making
it convenient and easy to install. With better electric conductivity, it ideally protects
your motherboard against static electricity and shields it against Electronic Magnetic
Interference (EMI).
ASUS Q-Connector
Make connection quick and accurate!
The ASUS Q-Connector allows you to connect or disconnect chassis front panel cables
in one easy step with one complete module. This unique module eliminates the trouble
of plugging in one cable at a time, making connection quick and accurate. Refer to
page 2-40 for details.
ASUS EZ-Flash 2
Simply update BIOS from a USB ash drive before entering the OS
EZ Flash 2 is a user-friendly BIOS update utility. Simply launch this tool and update
BIOS from a USB ash drive before entering the OS. You can update your BIOS only in
a few clicks without preparing an additional oppy diskette or using an OS-based ash
utility. Refer to page 3-5 for details.
ASUS O.C. Prole
Conveniently restore or load multiple BIOS settings
Freely share and distribute favorite overclocking settings. The motherboard features
the ASUS O.C. Prole that allows users to conveniently store or load multiple BIOS
settings. The BIOS settings can be stored in the CMOS or a separate le, giving users
freedom to share and distribute their favorite overclocking settings. Refer to page 3-34
for details.
Chapter 1
ASUS P7P55D
1-5
Page 20
ASUS MyLogo2™
This feature allows you to convert your favorite photo into a 256-color boot logo for a more
Chapter 1
colorful and vivid image on your screen.
ASUS Multi-language BIOS
The multi-language BIOS allows you to select the language of your choice from the available
options. The localized BIOS setup menu helps you congure your system easier and faster.
1-6Chapter 1: Product Introduction
Page 21
Chapter 2
Chapter 2: Hardware information
2.1 Before you proceed
Take note of the following precautions before you install motherboard components or change
any motherboard settings.
• Unplug the power cord from the wall socket before touching any component.
• Before handling components, use a grounded wrist strap or touch a safely grounded
object or a metal object, such as the power supply case, to avoid damaging them due
to static electricity.
• Hold components by the edges to avoid touching the ICs on them.
• Whenever you uninstall any component, place it on a grounded antistatic pad or in the
bag that came with the component.
• Before you install or remove any component, ensure that the ATX power supply is
switched off or the power cord is detached from the power supply. Failure to do so
may cause severe damage to the motherboard, peripherals, or components.
ASUS P7P55D2-1
Page 22
2.2 Motherboard overview
2.2.1 Motherboard layout
Chapter 2
Refer to
2.8 Connectors
connectors.
2-2Chapter 2: Hardware information
for more information about rear panel connectors and internal
Page 23
2.2.2 Layout contents
Connectors/Jumpers/SlotsPage
1. ATX power connectors (24-pin EATXPWR, 8-pin EATX12V)2-38
2. LGA1156 CPU Socket2-5
3. DDR3 DIMM slots2-10
4. DRAM overvoltage jumper (3-pin OV_DRAM)2-26
5. CPU, chassis, and power fan connectors (4-pin CPU_FAN,
4-pin CHA_FAN1, 3-pin CHA_FAN2, 3-pin PWR_FAN)
6. Serial port connector (9-pin COM1)2-36
7. MemOK! switch2-24
8. IDE connector (40-1 pin PRI_EIDE)2-32
9. JMicron JMB363 Serial ATA connector (7-pin SATA_E1)2-34
10. P55 Serial ATA connectors (7-pin SATA1-6)2-33
11. System panel connector (20-8 pin PANEL)2-39
12. Clear RTC RAM (3-pin CLRTC)2-25
13. USB connectors (10-1 pin USB910, USB1112, USB1314)2-35
14. Standby power LED2-41
15. IEEE 1394a port connector (10-1 pin IE1394_2)2-36
16. Optical drive audio connector (4-pin CD)2-35
17. Front panel audio connector (10-1 pin AAFP)2-31
18. Digital audio connector (4-1 pin SPDIF_OUT)2-31
2-37
Chapter 2
ASUS P7P55D2-3
Page 24
2.2.3 Placement direction
When installing the motherboard, ensure that you place it into the chassis in the correct
orientation. The edge with external ports goes to the rear part of the chassis as indicated in
the image below.
2.2.4 Screw holes
Place nine screws into the holes indicated by circles to secure the motherboard to the
chassis.
Chapter 2
DO NOT overtighten the screws! Doing so can damage the motherboard.
Place this side towards
the rear of the chassis
2-4Chapter 2: Hardware information
Page 25
2.3 Central Processing Unit (CPU)
A
B
The motherboard comes with a surface mount LGA1156 socket designed for the Intel®
Core™ i7 / Core™ i5 Processor.
Ensure that all power cables are unplugged before installing the CPU.
• Upon purchase of the motherboard, ensure that the PnP cap is on the socket and
the socket contacts are not bent. Contact your retailer immediately if the PnP cap
is missing, or if you see any damage to the PnP cap/socket contacts/motherboard
components. ASUS will shoulder the cost of repair only if the damage is shipment/
transit-related.
• Keep the cap after installing the motherboard. ASUS will process Return Merchandise
Authorization (RMA) requests only if the motherboard comes with the cap on the
LGA1156 socket.
• The product warranty does not cover damage to the socket contacts resulting from
incorrect CPU installation/removal, or misplacement/loss/incorrect removal of the PnP
cap.
2.3.1 Installing the CPU
To install a CPU:
1. Locate the CPU socket on the motherboard.
Chapter 2
2. Press the load lever with your thumb (A),
and then move it to the right (B) until it is
Load lever
released from the retention tab.
To prevent damage to the socket pins,
do not remove the PnP cap unless
you are installing a CPU.
Retention tab
ASUS P7P55D2-5
Page 26
3. Lift the load lever in the direction of the
arrow until the load plate is completely
lifted.
Chapter 2
4. Remove the PnP cap from the CPU
socket.
Load plate
PnP cap
5. Position the CPU over the socket,
ensuring that the gold triangle is on the
bottom-left corner of the socket, and then
t the socket alignment keys into the CPU
CPU notches
notches.
The CPU ts in only one correct
orientation. DO NOT force the CPU
into the socket to prevent bending
the connectors on the socket and
damaging the CPU!
2-6Chapter 2: Hardware information
Gold
triangle
mark
Alignment keys
Page 27
6. Apply some Thermal Interface Material
C
B
A
to the exposed area of the CPU that the
heatsink will be in contact with, ensuring
that it is spread in an even thin layer.
Some heatsinks come with preapplied thermal paste. If so, skip this
step.
The Thermal Interface Material is
toxic and inedible. DO NOT eat it. If
it gets into your eyes or touches your
skin, wash it off immediately, and seek
professional medical help.
7. Close the load plate (A), and then push
down the load lever (B), ensuring that
the front edge of the load plate slides
under the retention knob (C).
Chapter 2
8. Insert the load lever under the retention
tab.
ASUS P7P55D2-7
Page 28
2.3.2 Installing the CPU heatsink and fan
The Intel® LGA1156 processor requires a specially designed heatsink and fan assembly to
ensure optimum thermal condition and performance.
Chapter 2
To install the CPU heatsink and fan:
• When you buy a boxed Intel® processor, the package includes the CPU fan and
heatsink assembly. If you buy a CPU separately, ensure that you use only
Intel®-certied multi-directional heatsink and fan.
• Your Intel® LGA1156 heatsink and fan assembly comes in a push-pin design and
requires no tool to install.
• Use an LGA1156-compatible CPU heatsink and fan assembly only. The LGA1156
socket is incompatible with the LGA775 and LGA1366 sockets in size and dimension.
If you purchased a separate CPU heatsink and fan assembly, ensure that the Thermal
Interface Material is properly applied to the CPU heatsink or CPU before you install the
heatsink and fan assembly.
Ensure that you have installed the motherboard to the chassis before you install the CPU
fan and heatsink assembly.
1. Place the heatsink on top of the installed
A
CPU, making sure that the four fasteners
match the holes on the motherboard.
2. Push down two fasteners at a time in
B
B
a diagonal sequence to secure the
heatsink and fan assembly in place.
A
B
A
1
B
2-8Chapter 2: Hardware information
A
Orient the heatsink and fan assembly such that the CPU fan cable is closest to the CPU fan
connector.
1
Page 29
3. Connect the CPU fan cable to the connector on the motherboard labeled CPU_FAN.
DO NOT forget to connect the CPU fan connector! Hardware monitoring errors can occur if
you fail to plug this connector.
2.3.3 Uninstalling the CPU heatsink and fan
To uninstall the CPU heatsink and fan:
Chapter 2
1. Disconnect the CPU fan cable from the
connector on the motherboard.
2. Rotate each fastener counterclockwise.
3. Pull up two fasteners at a time in a
B
A
B
diagonal sequence to disengage the
heatsink and fan assembly from the
motherboard.
A
B
B
A
A
4. Carefully remove the heatsink and fan assembly from the motherboard.
ASUS P7P55D2-9
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2.4 System memory
2.4.1 Overview
The motherboard comes with four Double Data Rate 3 (DDR3) Dual Inline Memory Modules
(DIMM) sockets.
A DDR3 module has the same physical dimensions as a DDR2 DIMM but is notched
differently to prevent installation on a DDR2 DIMM socket. DDR3 modules are developed for
better performance with less power consumption.
The gure illustrates the location of the DDR3 DIMM sockets:
Chapter 2
Recommended memory congurations
One DIMM:
Install one memory module in slot A1 or B1 rst as a single-channel operation.
Two DIMMs (dual-channel operation):
Four DIMMs (dual-channel operation):
2-10Chapter 2: Hardware information
Page 31
2.4.2 Memory congurations
You may install 1GB, 2GB and 4GB unbuffered and non-ECC DDR3 DIMMs into the DIMM
sockets.
• You may install varying memory sizes in Channel A and Channel B. The system maps
the total size of the lower-sized channel for the dual-channel conguration. Any excess
memory from the higher-sized channel is then mapped for single-channel operation.
• Due to Intel spec denition, X.M.P. DIMMs are supported for one DIMM per channel
only.
• According to Intel CPU spec, DIMM voltage below 1.65V is recommended to protect
the CPU.
• According to Intel CPU spec, CPUs with a core frequency of 2.66G support the
maximum DIMM frequency of up to DDR3-1333. To use DIMMs of a higher frequency
with a 2.66G CPU, enable the
3.5.3 Ai Overclock Tuner
• Always install DIMMs with the same CAS latency. For optimum compatibility, we
recommend that you obtain memory modules from the same vendor.
• Due to the memory address limitation on 32-bit Windows OS, when you install 4GB
or more memory on the motherboard, the actual usable memory for the OS can be
about 3GB or less. For effective use of memory, we recommend that you do any of the
following:
- Use a maximum of 3GB system memory if you are using a 32-bit Windows OS.
- Install a 64-bit Windows OS when you want to install 4GB or more on the
motherboard.
For more details, refer to the Microsoft® support site at
http://support.microsoft.com/kb/929605/en-us.
• This motherboard does not support DIMMs made up of 512Mb (64MB) chips or less
(Memory chip capacity counts in Megabit, 8 Megabit/Mb = 1 Megabyte/MB).
DRAM O.C. Prole
for details.
feature in BIOS. Refer to section
Chapter 2
• The default memory operation frequency is dependent on its Serial Presence Detect
(SPD), which is the standard way of accessing information from a memory module.
Under the default state, some memory modules for overclocking may operate at a
lower frequency than the vendor-marked value. To operate at the vendor-marked
or at a higher frequency, refer to section 3.5 Ai Tweaker menu for manual memory
frequency adjustment.
• For system stability, use a more efcient memory cooling system to support a full
G.SKILL F3-17066CL9T-6GB-T 6GB(Kit of 3) DS N/AHeat-Sink Package 9-9-9-24(1066-8-7-7-20) 1.65••
F3-16000CL9T-6GBPS(XMP)6GB(Kit of 3)
OCZ3P20002GK(EPP)2GB(Kit of 2)
SS/DSChip
Brand
SS/DSChip
DS
SS
Chip NO.
Brand
N/AHeat-Sink Package
N/AHeat-Sink Package
Chip NO.
Timing
Dimm(Bios)
Timing
Dimm(Bios)
9-9-9-24(1066-8-8-8-20) 1.65
91.9
Voltage
Voltage
DIMM socket support
(Optional)
A*B*C*
Side(s): SS - Single-sided DS - Double-sided
DIMM support:
• A*: Supports one (1) module inserted into slot A1 or B1 as Single-channel memory conguration.
• B*: Supports two (2) modules inserted into the blue slots (A1 and B1) as one pair of
Dual-channel memory conguration.
• C*: Supports four (4) modules inserted into both the blue and the black slots as two
pairs of Dual-channel memory conguration.
DIMM socket
support
(Optional)
A* B* C*
•
•
•
•
• ASUS exclusively provides hyper DIMM support function.
• Hyper DIMM support is subject to the physical characteristics of individual CPUs.
• According to Intel spec denition, DDR3-1600 is supported for one DIMM per channel
only. ASUS exclusively provides two DDR3-1600 DIMM support for each memory
channel.
• According to Intel CPU spec, CPUs with a core frequency of 2.66G support the
maximum DIMM frequency of up to DDR3-1333. To use DIMMs of a higher frequency
with a 2.66G CPU, enable the DRAM O.C. Prole feature in BIOS. Refer to section
3.5.3 Ai Overclock Tuner for details.
• Visit the ASUS website for the latest QVL.
2-18Chapter 2: Hardware information
Page 39
2.4.3 Installing a DIMM
Ensure to unplug the power supply before adding or removing DIMMs or other system
components. Failure to do so may cause severe damage to both the motherboard and the
components.
To install a DIMM
1. Press the retaining clip outward to
unlock a DIMM socket.
2. Align a DIMM on the socket such that
the notch on the DIMM matches the
break on the socket.
A DIMM is keyed with a notch so that it ts in only one direction. DO NOT force a DIMM into
a socket to avoid damaging the DIMM.
3. Firmly insert the DIMM into the socket
until the retaining clip snaps back in
place and the DIMM is properly seated.
2.4.4 Removing a DIMM
To remove a DIMM
1. Press the retaining clip outward to
unlock the DIMM.
2
DIMM notch
1
Unlocked retaining clip
Chapter 2
3
Locked Retaining Clip
2
1
Support the DIMM lightly with your ngers when pressing the retaining clip. The DIMM
might get damaged when it ips out with extra force.
2. Remove the DIMM from the socket.
ASUS P7P55D2-19
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2.5 Expansion slots
In the future, you may need to install expansion cards. The following subsections describe the
slots and the expansion cards that they support.
2.5.1 Installing an expansion card
To install an expansion card
1. Before installing the expansion card, read the documentation that came with it and
make the necessary hardware settings for the card.
2. Remove the system unit cover (if your motherboard is already installed in a chassis).
Chapter 2
3. Remove the bracket opposite the slot that you intend to use. Keep the screw for later
use.
4. Align the card connector with the slot and press rmly until the card is completely
seated on the slot.
5. Secure the card to the chassis with the screw you removed earlier.
6. Replace the system cover.
2.5.2 Conguring an expansion card
After installing the expansion card, congure it by adjusting the software settings.
1. Turn on the system and change the necessary BIOS settings, if any. See Chapter 3 for
information on BIOS setup.
2. Assign an IRQ to the card. Refer to the tables on the next page.
3. Install the software drivers for the expansion card.
Ensure to unplug the power cord before adding or removing expansion cards. Failure to do
so may cause you physical injury and damage motherboard components.
When using PCI cards on shared slots, ensure that the drivers support “Share IRQ” or that
the cards do not need IRQ assignments. Otherwise, conicts will arise between the two PCI
groups, making the system unstable and the card inoperable. Refer to the table on the next
page for details.
2-20Chapter 2: Hardware information
Page 41
2.5.3 Interrupt assignments
Standard interrupt assignments
IRQPriority Standard function
01System Timer
12Keyboard Controller
2–Redirect to IRQ#9
412Communications Port (COM1)*
513IRQ Holder for PCI Steering*
714Reserved
83System CMOS/Real Time Clock
94IRQ Holder for PCI Steering*
105IRQ Holder for PCI Steering*
116IRQ Holder for PCI Steering*
127Reserved
138Numeric Data Processor
149Primary IDE Channel
* These IRQs are usually available for PCI devices.
IRQ assignments for this motherboard
ABCDEFGH
PCIE x16_1shared–––––––
PCIE x16_2–shared––––––
USB 2.0 controller 1 shared
USB 2.0 controller 2–––––––shared
HD audio
Onboard SATA––––shared––
––
–––––
–
––––
–
shared
Chapter 2
–
ASUS P7P55D2-21
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2.5.4 PCI slots
The PCI slots support cards such as a LAN card, SCSI card, USB card, and other cards that
comply with PCI specications. Refer to the gure below for the location of the slot.
2.5.5 PCI Express x1 slots
This motherboard supports PCI Express x1 network cards, SCSI cards, and other cards that
comply with the PCI Express specications. Refer to the gure below for the location of the
slots.
2.5.6 PCI Express 2.0 x16 slots
This motherboard has two PCI Express 2.0 x16 slots that support PCI Express x16 2.0
graphic cards complying with the PCI Express specications. Refer to the gure below for the
location of the slots.
Chapter 2
PCI slot 3
PCI slot 2
PCI slot 1
PCIe 2.0 x16_2 slot (black, at x4 link)
PCI Express x1_2 slot
PCI Express x1_1 slot
PCIe 2.0 x16_1 slot (blue, at x16 link)
2-22Chapter 2: Hardware information
Page 43
VGA conguration
Single VGA/PCIe card
Dual VGA/PCIe card
• In single VGA card mode, use the PCIe 2.0 x16_1 slot (blue) for a PCI Express x16
graphics card to get better performance.
• We recommend that you provide sufcient power when running CrossFireX™ mode.
See page 2-38 for details.
• Connect a chassis fan to the motherboard connector labeled CHA_FAN1/2 when
using multiple graphics cards for better thermal environment. See page 2-37 for
details.
PCI Express operating mode
PCIe x16_1PCIe x16_2
x16 (Recommend for
single VGA)
x4 (PCIe card)
x16x4
Chapter 2
ASUS P7P55D2-23
Page 44
2.6 Onboard switch
Onboard switch allows you to ne-tune performance when working on a bare or open-
case system. This is ideal for overclockers and gamers who continually change settings to
enhance system performance.
MemOK! switch
Installing DIMMs that are incompatible with the motherboard may cause system boot failure,
and the DRAM_LED near the MemOK! switch lights continuously. Press and hold the
MemOK! switch until the DRAM_LED starts blinking to begin automatic memory compatibility
tuning for successful boot.
Chapter 2
• Refer to section
• The DRAM_LED also lights when the DIMM is not properly installed. Turn off the
system and reinstall the DIMM before using the MemOK! function.
• The MemOK! switch does not function under Windows™ OS environment.
• During the tuning process, the system loads and tests failsafe memory settings. It
takes about 30 seconds for the system to test one set of failsafe settings. If the test
fails, the system reboots and test the next set of failsafe settings. The blinking speed
of the DRAM_LED increases, indicating different test processes.
• Due to memory tuning requirement, the system automatically reboots when each
timing set is tested. If the installed DIMMs still fail to boot after the whole tuning
process, the DRAM_LED lights continuously. Replace the DIMMs with ones
recommended in the Memory QVL (Qualied Vendors Lists) in this user manual or on
the ASUS website at www.asus.com.
• If you turn off the computer and replace DIMMs during the tuning process, the system
continues memory tuning after turning on the computer. To stop memory tuning, turn
off the computer and unplug the power cord for about 5–10 seconds.
• If your system fails to boot due to BIOS overclocking, press the MemOK! switch to
boot and load BIOS default settings. A message will appear during POST reminding
you that the BIOS has been restored to its default settings.
• We recommend that you download and update to the latest BIOS version from the
ASUS website at www.asus.com after using the MemOK! function.
2-24Chapter 2: Hardware information
2.9 Onboard LEDs
for the exact location of the DRAM_LED.
Page 45
2.7 Jumpers
1. Clear RTC RAM (3-pin CLRTC)
This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can
clear the CMOS memory of date, time, and system setup parameters by erasing
the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in
CMOS, which include system setup information such as system passwords.
To erase the RTC RAM
1. Turn OFF the computer and unplug the power cord.
2. Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3
for about 5–10 seconds, then move the cap back to pins 1-2.
3. Plug the power cord and turn ON the computer.
4. Hold down the <Del> key during the boot process and enter BIOS setup to re-enter
data.
Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default
position. Removing the cap will cause system boot failure!
• If the steps above do not help, remove the onboard battery and move the jumper again
to clear the CMOS RTC RAM data. After the CMOS clearance, reinstall the battery.
• You do not need to clear the RTC when the system hangs due to overclocking. For
system failure due to overclocking, use the C.P.R. (CPU Parameter Recall) feature.
Shut down and reboot the system so the BIOS can automatically reset parameter
settings to default values.
• Due to the chipset behavior, AC power off is required to enable C.P.R. function. You
must turn off and on the power supply or unplug and plug the power cord before
rebooting the system.
Chapter 2
ASUS P7P55D2-25
Page 46
2. DRAM overvoltage setting (3-pin OV_DRAM)
This jumper allows you to enable or disable the DRAM overvoltage settings in BIOS.
Chapter 2
OV_DRAM
Pins 1-2 (Enable OV)up to 2.5V
Pins 2-3 (Default)up to 2.0V
• Before you change the jumper settings for extra-high overvoltage ability, use the BIOS
items rst to adjust the desired DRAM performance. Ensure your system functions
well under the highest BIOS voltage settings before you change the setting of the
jumper.
• The system may need a better cooling system, such as a water cooling system, to
maintain stability under high voltage settings.
2-26Chapter 2: Hardware information
Page 47
2.8 Connectors
2.8.1 Rear panel connectors
Chapter 2
Rear panel connectors
1. PS/2 mouse port (green)7. Optical S/PDIF Out port
2. USB 2.0 ports 7 and 88. External SATA port
3. USB 2.0 ports 5 and 69. IEEE 1394a port
4. USB 2.0 ports 3 and 410. USB 2.0 ports 1 and 2
5. LAN (RJ-45) port*11. Audio I/O ports**
6. PS/2 keyboard port (purple)
* Refer to the LAN port table on the next page.
** Refer to the audio port denitions table on the next page.
ASUS P7P55D2-27
Page 48
*LAN port LED indications
Activity Link LEDSpeed LED
StatusDescriptionStatusDescription
OFFNo linkOFF10 Mbps connection
ORANGELinkedORANGE100 Mbps connection
BLINKINGData activityGREEN1 Gbps connection
** Audio 2, 4, 6, or 8-channel conguration
ACT/LINK
LED
LAN port
SPEED
LED
PortHeadset
Chapter 2
Light Blue Line InLine InLine InLine In
LimeLine OutFront Speaker OutFront Speaker OutFront Speaker Out
PinkMic InMic InMic InMic In
Orange––Center/SubwooferCenter/Subwoofer
Black–Rear Speaker OutRear Speaker OutRear Speaker Out
Gray–––Side Speaker Out
2.8.2 Audio I/O connections
Audio I/O ports
Connect to Headphone and Mic
2-channel
4-channel6-channel8-channel
2-28Chapter 2: Hardware information
Page 49
Connect to Stereo Speakers
Connect to 2.1 channel Speakers
Chapter 2
Connect to 4.1 channel Speakers
ASUS P7P55D2-29
Page 50
Connect to 5.1 channel Speakers
Chapter 2
Connect to 7.1 channel Speakers
2-30Chapter 2: Hardware information
Page 51
2.8.3 Internal connectors
1. Digital audio connector (4-1 pin SPDIF_OUT)
This connector is for an additional Sony/Philips Digital Interface (S/PDIF) port(s).
Connect the S/PDIF Out module cable to this connector, then install the module to a
slot opening at the back of the system chassis.
The S/PDIF module is purchased separately.
2. Front panel audio connector (10-1 pin AAFP)
This connector is for a chassis-mounted front panel audio I/O module that supports
either HD Audio or legacy AC`97 audio standard. Connect one end of the front panel
audio I/O module cable to this connector.
• We recommend that you connect a high-denition front panel audio module to this
connector to avail of the motherboard’s high-denition audio capability.
• If you want to connect a high-denition front panel audio module to this connector, setIf you want to connect a high-denition front panel audio module to this connector, set
the
Front Panel Type
AC'97 front panel audio module to this connector, set the item to
this connector is set to
item in the BIOS setup to
[HD Audio]
.
[HD Audio];
if you want to connect an
[AC97]
Chapter 2
. By default,
ASUS P7P55D2-31
Page 52
3. IDE connector (40-1 pin PRI_EIDE)
The onboard IDE connector is for the Ultra DMA 133/100/66 signal cable. There are
three connectors on each Ultra DMA 133/100/66 signal cable: blue, black, and gray.
Connect the blue connector to the motherboard’s IDE connector, then select one of the
following modes to congure your device.
Chapter 2
Drive jumper settingMode of
Cable connector
device(s)
Single deviceCable-Select or Master-Black
Two devicesCable-SelectMasterBlack
SlaveGray
MasterMasterBlack or gray
SlaveSlave
• Pin 20 on the IDE connector is removed to match the covered hole on the Ultra DMA
cable connector. This prevents incorrect insertion when you connect the IDE cable.
• Use the 80-conductor IDE cable for Ultra DMA 133/100/66 IDE devices.
If any device jumper is set as “Cable-Select”, ensure that all other device jumpers have the
same setting.
2-32Chapter 2: Hardware information
Page 53
4. Intel® P55 Serial ATA connectors (7-pin SATA 1-6)
These connectors are for the Serial ATA signal cables for Serial ATA hard disk drives
and optical disc drives.
If you installed Serial ATA hard disk drives, you can create a RAID 0, 1, 5, and 10
conguration with the Intel® Matrix Storage Technology through the onboard Intel® P55
chipset.
• T
hese connectors are set to Standard IDE mode by default. In Standard IDE mode,
you can connect Serial ATA boot/data hard disk drives to these connectors. If you
intend to create a Serial ATA RAID set using these connectors, set the Congure SATA as item in the BIOS to [RAID]. See section 3.4.2 Storage Conguration for
details.
• Before creating a RAID set, refer to section 4.5 RAID congurations or the RAID
manual bundled in the motherboard support DVD.
•
You must install Windows® XP Service Pack 2 or later version before using Serial ATA
hard disk drives. The Serial ATA RAID feature (RAID 0, 1, 5, and 10) is available only if
you are using Windows® XP SP2 or later version.
•
When using hot-plug and NCQ, set the Congure SATA as item in the BIOS to
[AHCI]. See section 3.4.2 Storage Conguration for details.
Chapter 2
ASUS P7P55D2-33
Page 54
5. JMicron® JMB363 Serial ATA connector (7-pin SATA_E1)
This connector is for the Serial ATA signal cable for Serial ATA hard disk drives and
optical disc drives.
Chapter 2
2-34Chapter 2: Hardware information
Page 55
6. USB connectors (10-1 pin USB910, USB1112, USB1314)
These connectors are for USB 2.0 ports. Connect the USB module cable to any of
these connectors, then install the module to a slot opening at the back of the system
chassis. These USB connectors comply with USB 2.0 specication that supports up to
480 Mbps connection speed.
Never connect a 1394 cable to the USB connectors. Doing so will damage the motherboard!
You can connect the front panel USB cable to the ASUS Q-Connector (USB, blue) rst, and
then install the Q-Connector (USB) to the USB connector onboard if your chassis supports
front panel USB ports.
7. Optical drive audio connector (4-pin CD)
These connectors allow you to receive stereo audio input from sound sources such as
a CD-ROM, TV tuner, or MPEG card.
Chapter 2
ASUS P7P55D2-35
Page 56
8. IEEE 1394a port connector (10-1 pin IE1394_2)
This connector is for an IEEE 1394a port. Connect the IEEE 1394a module cable
to this connector, then install the module to a slot opening at the back of the system
chassis.
Chapter 2
9. Serial port connector (10-1 pin COM1)
This connector is for a serial (COM) port. Connect the serial port module cable to this
connector, then install the module to a slot opening at the back of the system chassis.
Never connect a USB cable to the IEEE 1394a connector. Doing so will damage the
motherboard!
The fan connectors support cooling fans of 350 mA~1000 mA (12 W max.) or a total
of 1 A~4 A (84 W max.) at +12V. Connect the fan cables to the fan connectors on the
motherboard, ensuring that the black wire of each cable matches the ground pin of the
connector.
Do not forget to connect the fan cables to the fan connectors. Insufcient air ow inside the
system may damage the motherboard components. These are not jumpers! Do not place
jumper caps on the fan connectors!
• Only the CPU_FAN, CHA_FAN 1, and CHA_FAN 2 connectors support the FAN Xpert
feature.
• If you install two VGA cards, we recommend that you plug the rear chassis fan cable
to the motherboard connector labeled CHA_FAN1 or CHA_FAN2 for better thermal
environment.
ASUS P7P55D2-37
Chapter 2
Page 58
11. ATX power connectors (24-pin EATXPWR, 8-pin EATX12V)
These connectors are for ATX power supply plugs. The power supply plugs are
designed to t these connectors in only one orientation. Find the proper orientation and
push down rmly until the connectors completely t.
Chapter 2
• For a fully congured system, we recommend that you use a power supply unit
(PSU) that complies with ATX 12 V Specication 2.0 (or later version) and provides a
minimum power of 600 W.
• Do not forget to connect the 8-pin EATX12 V power plug. Otherwise, the system will
not boot.
• We recommend that you use a PSU with higher power output when conguring a
system with more power-consuming devices. The system may become unstable or
may not boot up if the power is inadequate.
• If you are uncertain about the minimum power supply requirement for your system,
refer to the Recommended Power Supply Wattage Calculator at
• If you want to use two high-end PCI Express x16 cards, use a PSU with 1000W power
or above to ensure the system stability.
http://support.asus.
for details.
2-38Chapter 2: Hardware information
Page 59
12. System panel connector (20-8 pin PANEL)
This connector supports several chassis-mounted functions.
• System power LED (2-pin PLED)
This 2-pin connector is for the system power LED. Connect the chassis power LED
cable to this connector. The system power LED lights up when you turn on the system
power, and blinks when the system is in sleep mode.
• Hard disk drive activity LED (2-pin IDE_LED)
This 2-pin connector is for the HDD Activity LED. Connect the HDD Activity LED cable
to this connector. The IDE LED lights up or ashes when data is read from or written to
the HDD.
• System warning speaker (4-pin SPEAKER)
This 4-pin connector is for the chassis-mounted system warning speaker. The speaker
allows you to hear system beeps and warnings.
• ATX power button/soft-off button (2-pin PWRSW)
This connector is for the system power button. Pressing the power button turns the
system on or puts the system in sleep or soft-off mode depending on the BIOS settings.
Pressing the power switch for more than four seconds while the system is ON turns the
system OFF.
• Reset button (2-pin RESET)
This 2-pin connector is for the chassis-mounted reset button for system reboot without
turning off the system power.
Chapter 2
ASUS P7P55D2-39
Page 60
2.8.4. ASUS Q-Connector (system panel)
IDE_LED
POWER SW
RESET SW
IDE_LED-
IDE_LED+
PWR
Reset
Ground
Ground
Use the ASUS Q-Connector to connect/disconnect the chassis front panel cables.
To install the ASUS Q-Connector
1. Connect the front panel cables to the ASUS
Q-Connector.
Refer to the labels on the Q-Connector to
know the detailed pin denitions, and then
match them to their respective front panel
cable labels.
Chapter 2
2. Install the ASUS Q-Connector to the system
panel connector, making sure the orientation
matches the labels on the motherboard.
The labels on the front panel cables
may vary depending on the chassis
model.
3. The front panel functions are now enabled.
The gure shows the Q-Connector is properly
installed on the motherboard.
2-40Chapter 2: Hardware information
Page 61
2.9 Onboard LEDs
1. POST State LEDs
POST State LEDs check key components (CPU, DRAM, VGA card, and HDD) in
sequence during motherboard booting process. If an error is found , the LED next to
the error device will continue lighting until the problem is solved. This user-friendly
design provides an intuitive way to locate the root problem within seconds.
You may disable the POST State LEDs in BIOS. Refer to section
Conguration
2. Standby power LED
The motherboard comes with a standby power LED that lights up to indicate that the
system is ON, in sleep mode, or in soft-off mode. This is a reminder that you should
shut down the system and unplug the power cable before removing or plugging in any
motherboard component. The illustration below shows the location of the onboard LED.
for details.
3.8.2 Boot Setting
Chapter 2
ASUS P7P55D2-41
Page 62
2.10 Starting up for the rst time
1. After making all the connections, replace the system case cover.
2. Ensure that all switches are off.
3. Connect the power cord to the power connector at the back of the system chassis.
4. Connect the power cord to a power outlet that is equipped with a surge protector.
5. Turn on the devices in the following order:
a. Monitor
b. External SCSI devices (starting with the last device on the chain)
c. System power
6. After applying power, the system power LED on the system front panel case lights up.
For systems with ATX power supplies, the system LED lights up when you press the
ATX power button. If your monitor complies with the “green” standards or if it has a
“power standby” feature, the monitor LED may light up or change from orange to green
Chapter 2
after the system LED turns on.
The system then runs the power-on self tests or POST. While the tests are running, the
BIOS beeps (see the BIOS beep codes table below) or additional messages appear on
the screen. If you do not see anything within 30 seconds from the time you turned on
the power, the system may have failed a power-on test. Check the jumper settings and
connections or call your retailer for assistance.
BIOS BeepDescription
One short beepVGA detected
One continuous beep followed by two
short beeps then a pause (repeated)
One continuous beep followed by three
short beeps
One continuous beep followed by four
short beeps
Quick boot set to disabled
No keyboard detected
No memory detected
No VGA detected
Hardware component failure
7. At power on, hold down the <Delete> key to enter the BIOS Setup. Follow the
instructions in Chapter 3.
2.11 Turning off the computer
While the system is ON, pressing the power switch for less than four seconds puts the system
on sleep mode or soft-off mode, depending on the BIOS setting. Pressing the power switch
for more than four seconds lets the system enter the soft-off mode regardless of the BIOS
setting. Refer to section
2-42Chapter 2: Hardware information
3.7 Power Menu
in Chapter 3 for details.
Page 63
Chapter 3
Chapter 3: BIOS setup
3.1 Knowing BIOS
BIOS (Basic Input and Output System) stores system hardware settings such as storage
device conguration, overclocking settings, advanced power management, and boot device
conguration that are needed for system startup in the motherboard CMOS. In normal
circumstances, the default BIOS settings apply to most conditions to ensure optimum
performance. We recommend that you not change the default BIOS settings except in
the following circumstances:
• An error message appears on the screen during the system bootup and requests you to
run the BIOS Setup.
• You have installed a new system component that requires further BIOS settings or
update.
Inappropriate settings of the BIOS may result to instability or failure to boot. We strongly
recommend that you change the BIOS settings only with the help of a trained service
personnel.
3.2 Updating BIOS
The ASUS website publishes the latest BIOS versions to provide enhancements on system
stability, compatibility, or performance. However, BIOS updating is potentially risky. If there
is no problem using the current version of BIOS, DO NOT manually update the BIOS.
Inappropriate BIOS updating may result in the system’s failure to boot. Carefully follow the
instructions of this chapter to update your BIOS if necessary.
Visit the ASUS website (www.asus.com) to download the latest BIOS le for this
motherboard.
The following utilities allow you to manage and update the motherboard BIOS setup program.
1. ASUS Update: Updates the BIOS in Windows® environment.
2. ASUS EZ Flash 2: Updates the BIOS using a USB ash disk.
3. ASUS CrashFree BIOS 3 utility: Restores the BIOS using the motherboard support
DVD or other removable devices when the BIOS le fails or gets corrupted.
Refer to the corresponding sections for details on these utilities.
Save a copy of the original motherboard BIOS le to a USB ash disk in case you need to
restore the BIOS in the future. Copy the original motherboard BIOS using the ASUS Update
utility.
3.2.1 ASUS Update utility
The ASUS Update is a utility that allows you to manage, save, and update the motherboard
BIOS in Windows® environment. The ASUS Update utility allows you to:
• Save the current BIOS le
• Download the latest BIOS le from the Internet
• Update the BIOS from an updated BIOS le
• Update the BIOS directly from the Internet
• View the BIOS version information
This utility is available in the support DVD that comes with the motherboard package.
ASUS Update requires an Internet connection either through a network or an Internet
Service Provider (ISP).
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Installing ASUS Update
To install ASUS Update:
1. Place the support DVD in the optical drive.
2. From the Main menu, click the Utilities tab, and then click Install ASUS Update VX.XX.XX.
3. The ASUS Update utility is copied to your system.
Updating the BIOS
To update the BIOS:
1. From the Windows® desktop, click Start
> Programs > ASUS > ASUSUpdate
> ASUSUpdate to launch the ASUS
Update utility.
2. From the dropdown list, select any of the updating process.
Chapter 3
Quit all Windows® applications before you update the BIOS using this utility.
Updating from the Internet
a. SelectSelect Update BIOS from the
Internet, and then click Next.
3-2Chapter 3: BIOS setup
Page 65
b. Select the ASUS FTP site
nearest you to avoid network
trafc, or click Auto Select. Click Next.
c. From the FTP site, select the BIOS
version that you wish to download,
then click Next.
Updating from a BIOS file
a. SelectSelect Update BIOS from a le,
then click Next.
ASUS P7P55D
Chapter 3
3-3
Page 66
b. Locate the BIOS le from the OpenLocate the BIOS le from the Open
window, then click Open.
3. Follow the onscreen instructions to complete the update process.
Chapter 3
P7P55D.ROM
P7P55D
The ASUS Update utility is capable of updating itself through the Internet. Always update
the utility to avail all its features.
Ensure to load the BIOS default settings to ensure system compatibility and stability.
Select the Load Setup Defaults item under the Exit menu. See section 3.10 Exit Menu for
details.
3-4Chapter 3: BIOS setup
Page 67
3.2.2 ASUS EZ Flash 2 utility
The ASUS EZ Flash 2 feature allows you to update the BIOS without using an OS-based
utility.
Before you start using this utility, download the latest BIOS from the ASUS website at www.
asus.com.
To update the BIOS using EZ Flash 2
1. Insert the USB ash disk that contains the latest BIOS le to the USB port, and then
launch EZ Flash 2 in any of these two ways:
• Press <Alt> + <F2> during POST.
• Enter the BIOS setup program. Go to the Tools menu to select EZ Flash 2 and
press <Enter> to enable it.
Press <Tab> to switch between drives until the correct BIOS le is found.
ASUSTek EZ Flash 2 BIOS ROM Utility V4.00
FLASH TYPE: MXIC 25L8005
Current ROM
BOARD: P7P55D
VER: 0157
DATE: 06/19/2009
PATH: A:\
A:
Note
[Enter] Select or Load [Tab] Switch [V] Drive Info
[Up/Down/Home/End] Move [B] Backup [Esc] Exit
Update ROM
BOARD: Unknown
VER: Unknown
DATE: Unknown
2. When the correct BIOS le is found, EZ Flash 2 performs the BIOS update process
and automatically reboots the system when done.
• Only a USB ash disk with FAT 32/16 format and single partition can support the
ASUS EZ Flash 2 utility.
• DO NOT shut down or reset the system while updating the BIOS to prevent system
boot failure!
Ensure to load the BIOS default settings to ensure system compatibility and stability. Select
the Load Setup Defaults item under the Exit menu. Refer to section 3.10 Exit Menu for
details.
ASUS P7P55D
Chapter 3
3-5
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3.2.3 ASUS CrashFree BIOS 3 utility
The ASUS CrashFree BIOS 3 utility is an auto recovery tool that allows you to restore the
BIOS le when it fails or gets corrupted during the updating process. You can restore a
corrupted BIOS le using the motherboard support DVD or a USB ash drive that contains
the BIOS le.
The BIOS le in the motherboard support DVD may be older than the BIOS le published
on the ASUS ofcial website. If you want to use the newer BIOS le, download the le at
support.asus.com and save it to a USB ash drive.
Recovering the BIOS
To recover the BIOS
1. Turn on the system.
2. Insert the motherboard support DVD to the optical drive, or the USB ash drive
containing the BIOS le to the USB port.
3. The utility automatically checks the devices for the BIOS le. When found, the utility
reads the BIOS le and starts ashing the corrupted BIOS le.
4. Turn off the system after the utility completes the updating process and power on
again.
5. The system requires you to enter BIOS Setup to recover BIOS setting. To ensure
system compatibility and stability, we recommend that you press <F2> to load default
BIOS values.
DO NOT shut down or reset the system while recovering the BIOS! Doing so can cause
system boot failure!
Chapter 3
3.3 BIOS setup program
Use the BIOS Setup program to update the BIOS or congure its parameters. The BIOS
screens include navigation keys and brief online help to guide you in using the BIOS Setup
program.
Entering BIOS Setup at startup
To enter BIOS Setup at startup:
• Press <Delete> during the Power-On Self-Test (POST). If you do not press <Delete>,
POST continues with its routines.
Entering BIOS Setup after POST
To enter BIOS Setup after POST:
• Press <Ctrl>+<Alt>+<Del> simultaneously.
• Press the reset button on the system chassis.
• Press the power button to turn the system off then back on. Do this option only if you failed
to enter BIOS Setup using the rst two options.
3-6Chapter 3: BIOS setup
Page 69
Using the power button, reset button, or the <Ctrl>+<Alt>+<Del> keys to force reset from
a running operating system can cause damage to your data or system. We recommend to
always shut down the system properly from the operating system.
• The default BIOS settings for this motherboard apply for most conditions to ensure
optimum performance. If the system becomes unstable after changing any BIOS
settings, load the default settings to ensure system compatibility and stability. Select
the Load Setup Defaults item under the Exit menu. See section 3.10 Exit Menu for
details.
• The BIOS setup screens shown in this section are for reference purposes only, and
may not exactly match what you see on your screen.
• If the system fails to boot after changing any BIOS setting, try to clear the CMOS and
reset the motherboard to the default value. See section 2.6 Jumpers for details.
3.3.1 BIOS menu screen
Menu bar
Conguration eldsMenu items
General help
Main Ai Tweaker Advanced Power Boot Tools Exit
System Time [13:51:25]
System Date [Wed 07/07/2009]
Language [English]
Storage Conguration
System InformationSystem Information
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
BIOS SETUP UTILITY
Use [ENTER], [TAB]
or [SHIFT-TAB] to
select a eld.
Use [+] or [-] to
congure system Date.
←→ Select Screen
↑↓ Select Item
+- Change Field
Tab Select Field
F1 General Help
F10 Save and Exit
ESC Exit
Sub-menu items
3.3.2 Menu bar
The menu bar on top of the screen has the following main items:
Main
Ai Tweaker
Advanced
Power
Boot
Tools
Exit
For changing the basic system conguration
For changing the overclocking settings
For changing the advanced system settings
For changing the advanced power management (APM) conguration
For changing the system boot conguration
For conguring options for special functions
For selecting the exit options and loading default settings
Chapter 3
Navigation keys
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3.3.3 Navigation keys
At the bottom right corner of a menu screen are the navigation keys for that particular menu.
Use the navigation keys to select items in the menu and change the settings.
The navigation keys may differ from one screen to another.
3.3.4 Menu items
The highlighted item on the menu bar displays the specic items for that menu. For example,
selecting Main shows the Main menu items.
The other items (Advanced, Power, Boot, and Exit) on the menu bar have their respective
menu items.
3.3.5 Submenu items
A solid triangle before each item on any menu screen means that the item has a submenu. To
display the submenu, select the item and press <Enter>.
3.3.6 Conguration elds
These elds show the values for the menu items. If an item is user-congurable, you can
change the value of the eld opposite the item. You cannot select an item that is not usercongurable.
A congurable eld is enclosed in brackets, and is highlighted when selected. To change the
value of a eld, select it then press <Enter> to display a list of options. Refer to 3.3.7 Pop-up
window.
Chapter 3
3.3.7 Pop-up window
Select a menu item then press <Enter> to
display a pop-up window with the conguration
options for that item.
Main Advanced Power Boot Tools Exit
3.3.8 Scroll bar
A scroll bar appears on the right side of a
menu screen when there are items that do not
t on the screen. Press the Up/Down arrow
keys or <Page Up> / <Page Down> keys to
display the other items on the screen.
BIOS SETUP UTILITY
Suspend Mode [Auto]
ACPI Version Features [Disabled]
ACPI APIC support [Enabled]
APM Conguration
Hardware Monitor
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
Disabled
Enabled
Scroll bar
Pop-up window
Use [ENTER], [TAB] or
[SHIFT-TAB] to select
a eld.
Use [+] or [-] to
congure system Time.
←→ Select Screen
↑↓ Select Item
+- Change Field
Tab Select Field
F1 General Help
F10 Save and Exit
ESC Exit
3.3.9 General help
At the top right corner of the menu screen is a brief description of the selected item.
3-8Chapter 3: BIOS setup
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3.4 Main menu
When you enter the BIOS Setup program, the Main menu screen appears, giving you an
overview of the basic system information. You can also set the system time and date and
BIOS language in this menu.
Refer to 3.3.1 BIOS menuscreen for information on the menu screen items and how to
navigate through them.
Main Ai Tweaker Advanced Power Boot Tools Exit
System Time [13:51:25]
System Date [Tue 07/07/2009]
Language [English]
Storage Conguration
System InformationSystem Information
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
BIOS SETUP UTILITY
Use [ENTER], [TAB]
or [SHIFT-TAB] to
select a eld.
Use [+] or [-] to
congure system Date.
←→ Select Screen
↑↓ Select Item
+- Change Field
Tab Select Field
F1 General Help
F10 Save and Exit
ESC Exit
3.4.1 SATA 1-6
While entering Setup, the BIOS automatically detects the presence of SATA devices. There
is a separate submenu for each SATA device. Select a device item then press <Enter> to
display the SATA device information.
Type [Auto]
LBA/Large Mode [Auto]
Block(Multi-Sector Transfer)M [Auto]
PIO Mode [Auto]
DMA Mode [Auto]
SMART Monitoring [Auto]
32Bit Data Transfer [Enabled]
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
BIOS SETUP UTILITY
Select the type
of device connected
to the system.
←→ Select Screen
↑↓ Select Item
+- Change Field
F1 General Help
F10 Save and Exit
ESC Exit
Chapter 3
The BIOS automatically detects the values opposite the dimmed items (Device, Vendor, Size,
LBA Mode, Block Mode, PIO Mode, Async DMA, Ultra DMA, and SMART monitoring). These
values are not user-congurable.
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Type [Auto]
Allows you to select the type of SATA drive installed.
[Not Installed] Select this option if no SATA drive is installed.
[Auto] Allows automatic selection of the appropriate SATA device type.
[CDROM] Select this option if you are specically conguring a CD-ROM drive.
[ARMD] Select [ARMD] (ATAPI Removable Media Device) if your device is a ZIP,
LBA/Large Mode [Auto]
Enables or disables the LBA (Logical Block Addressing) mode.
[Auto] Select [Auto] to enable the LBA mode (Logical Block Addressing mode)
[Disabled] Disables this function.
Block (Multi-Sector Transfer) M [Auto]
Enables or disables data multi-sector transfers.
[Auto] When set to [Auto], the data transfer from and to the device occurs in
[Disabled] When set to [Disabled], the data transfer from and to the device occurs one
PIO Mode [Auto]
Chapter 3
[Auto] Allows automatic selection of the PIO (Programmed input/output) modes,
[0] [1] [2] [3] [4] Set the PIO mode to Mode 0, 1, 2, 3, or 4.
DMA Mode [Auto]
DMA (Direct Memory Access) allows your computer to transfer data to and from the hardware
devices installed with very little CPU overhead.
The DMA mode consists of SDMA (single-word DMA), MDMA (multi-word DMA), and UDMA
(Ultra DMA). Setting to [Auto] allows automatic selection of the DMA mode.
LS-120, or MO drive.
if the device supports this mode, and if the device was not previously
formatted with LBA mode disabled.
multiple sectors at a time if the device supports the multi-sector transfer
feature.
sector at a time.
which correspond to different data transfer rates.
SMART Monitoring [Auto]
[Auto] Allows automatic selection of S.M.A.R.T (Smart Monitoring, Analysis, and
[Enabled] Enables the S.M.A.R.T feature.
[Disabled] Disables the S.M.A.R.T feature.
Reporting Technology).
32Bit Data Transfer [Enabled]
[Enabled] Sets the IDE controller to combine two 16-bit reads from the hard disk
[Disabled] Disables this function.
3-10Chapter 3: BIOS setup
into a single 32-bit double word transfer to the processor. This makes
more efcient use of the PCI bus as fewer transactions are needed for the
transfer of a particular amount of data.
Page 73
3.4.2 Storage Conguration
The Storage Conguration menu allows you to congure your storage devices. Select an item
then press <Enter> to display the submenu.
Main
Storage Conguration
SATA Conguraton [Enhanced]
Congure SATA as [IDE]
Hard Disk Write Protect [Disabled]
IDE Detect Time Out (Sec) [35]
Sets the conguration for the Serial ATA connectors supported by the PCH chip.
Conguration options: [IDE] [RAID] [AHCI]
• If you want to use the Serial ATA hard disk drives as Parallel ATA physical storage
devices, keep the default setting [IDE].
• If you want the Serial ATA hard disk drives to use the Advanced Host Controller
Interface (AHCI), set this item to [AHCI]. The AHCI allows the onboard storage driver
to enable advanced Serial ATA features that increases storage performance on
random workloads by allowing the drive to internally optimize the order of commands.
• If you want to create a RAID 0, RAID 1, RAID 5, RAID 10, or the Intel® Matrix Storage
Technology conguration from the Serial ATA hard disk drives, set this item to [RAID].
Hard Disk Write Protect [Disabled]
Disables or enables device write protection. This will be effective only if the device is
accessed through BIOS. Conguration options: [Disabled] [Enabled]
BIOS SETUP UTILITY
Set [Compatible Mode]
when Legacy OS (i.e.
WIN ME, 98, NT4.0, MS
DOS) is used.
Set [Enhanced Mode]
when Native OS (i.e.
WIN2000, Win XP, Vista
is used.
IDE Detect Time Out (Sec) [35]
Selects the time out value for detecting ATA/ATAPI devices. Conguration options: [0] [5] [10]
[15] [20] [25] [30] [35]
3.4.3 AHCI Conguration
This menu is the section for AHCI conguration. It appears only when you set the item
Congure SATA as from the sub-menu of SATA Conguration to [AHCI].
Main
AHCI Settings
SATA Port1 [Not Detected]
SATA Port2 [Not Detected]
SATA Port3 [Not Detected]
SATA Port4 [Not Detected]
SATA Port5 [Not Detected]
SATA Port6 [Not Detected]
ASUS P7P55D
BIOS SETUP UTILITY
Some SATA CD/DVD in
AHCI mode need to
wait ready longer.
Chapter 3
3-11
Page 74
SATA Port1–6 [XXXX]
Displays the status of auto-detection of SATA devices.
Main
SATA Port1
Device :Not Detected
SATA Port1 [Auto]
SMART Monitoring [Enabled]
SATA Port1 [Auto]
Allows you to select the type of device connected to the system.
Conguration options: [Auto] [Not Installed]
SMART Monitoring [Enabled]
Allows you to set the Self-Monitoring, Analysis and Reporting Technology.
Congration options: [Disabled] [Enabled]
3.4.4 System Information
This menu gives you an overview of the general system specications. The BIOS automatically
detects the BIOS information, CPU specication, and system memory in this menu.
Main
BIOS Information
BIOS Version : 0153
BIOS Build Date : 06/11/09
EC BIOS Version : MBEC-0018
Chapter 3
Processor
Type : Genuine Intel(R) CPU @ 2.40GHz
Speed : 2400MHz
System Memory
Usable Size : 1016MB
BIOS SETUP UTILITY
BIOS SETUP UTILITY
Select the type
of devices connected
to the system.
3-12Chapter 3: BIOS setup
Page 75
3.5 Ai Tweaker menu
The Ai Tweaker menu items allow you to congure overclocking-related items.
Be cautious when changing the settings of the Ai Tweaker menu items. Incorrect eld
values can cause the system to malfunction.
The conguration options for this chapter vary depending on the CPU and DIMM model you
installed on the motherboard.
Main Ai Tweaker Advanced Power Boot Tools Exit
Congure System Performance Settings
OC Tuner Utility
OC Tuner limit Value [Good Performance]
Ai Overclock Tuner [Auto]
CPU Ratio Setting [Auto]
Intel(R) SpeedStep(TM) Tech [Enabled]
Intel(R) TurboMode Tech [Enabled]
Xtreme Phase Full Power Mode [Auto]
DRAM Frequency [Auto]
DRAM Timing Control
CPU Differential Amplitude [Auto]
CPU Clock Skew [Auto]
******* Please key in numbers directly! *******
CPU Voltage Mode [Offset]
Offset Voltage [Auto]
Current CPU Core Voltage [ 1.048V]
IMC Voltage [Auto]
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
BIOS SETUP UTILITY
Press ENTER to run the
utility to Tuner BCLK.
←→ Select Screen
↑↓ Select Item
Enter Go to Sub Screen
F1 General Help
F10 Save and Exit
ESC Exit
Scroll down to display the following items:
Current IMC Voltage [ 1.109V]
DRAM Voltage [Auto]
Current DRAM Voltage [ 1.500V]
CPU PLL Voltage [Auto]
Current CPU PLL Voltage [ 1.800V]
PCH Voltage [Auto]
Current PCH Voltage [ 1.040V]
DRAM DATA REF Voltage on CHA [Auto]
DRAM CTRL REF Voltage on CHA [Auto]
DRAM DATA REF Voltage on CHB [Auto]
DRAM CTRL REF Voltage on CHB [Auto]
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
3.5.1 OC Tuner Utility
Press the <ENTER> key to start automatic system overclocking. The OC Tuner Utility
automatically adjust system parameters and reboots several times for the best overclocking
result. DO NOT shut down the power before the auto-adjustment completes.
Chapter 3
3.5.2 OC Tuner limit Value [Good Performance]
Set an auto-adjustment limit value for OC Tuner Utility.
To obtain the best performance of the X.M.P. DIMM or 1600MHz DIMM, install only one
DIMM on each memory channel.
3.5.4 CPU Ratio Setting [Auto]
Allows you to adjust the ratio between CPU Core Clock and BCLK Frequency. Use the <+>
and <-> keys to adjust the value. The valid value ranges differently according to your CPU
model.
3-14Chapter 3: BIOS setup
Page 77
3.5.5 Intel(R) SpeedStep(TM) Tech [Enabled]
When set to [Disabled], the CPU runs at its default speed. When set to [Enabled], the CPU
speed is controlled by the operating system. Conguration options: [Disabled] [Enabled]
3.5.6 Intel(R) TurboMode Tech [Enabled]
This item appears only if you set the CPU Ratio Setting item to [Auto]. Turbo mode allows
processor cores to run faster than marked frequency in specic condition.
Conguration options: [Disabled] [Enabled]
3.5.7 Xtreme Phase Full Power Mode [Auto]
This item appears only if you set the CPU Ratio Setting item to [Auto].
Conguration options: [Auto] [Disabled] [Enabled]
The following two items appear only when you set the Ai Overclock Tuner item to
[Manual], [D.O.C.P.] or [X.M.P.].
BCLK Frequency [XXX]
Allows you to adjust the Internal Base Clock (BCLK). Use the <+> and <-> keys to adjust the
value. You can also type the desired value using the numeric keypad. The values range from
80 to 500.
PCIE Frequency [XXX]
Allows you to set the PCI Express frequency. Use the <+> and <-> keys to adjust the PCIE
frequency. The values range from 100 to 200.
• The DRAM Frequency conguration options vary with the BCLK Frequency item
settings.
• According to Intel CPU spec, CPUs with a core frequency of 2.66G support the
maximum DIMM frequency of up to DDR3 1333. To use DIMMs of a higher frequency
with a 2.66G CPU, enable the DRAM O.C. Prole feature in BIOS. Refer to section
3.5.3 Ai Overclock Tuner for details.
Selecting a very high DRAM frequency may cause the system to become unstable! If this
happens, revert to the default setting.
3.5.9. DRAM Timing Control [Auto]
The items in this menu allow you to set the DRAM timing control features.
The conguration options for some of the following items vary depending on the DIMMsdepending on the DIMMs
you install on the motherboard.
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1st Information: 7-7-7-20-4-59-8-6-20
The values vary depending on your settings of the following sub-items:
DRAM CAS# Latency [Auto]
Conguration options: [Auto] [3 DRAM Clock] [4 DRAM Clock] – [10 DRAM Clock] [11
DRAM Clock]
DRAM RAS# to CAS# Delay [Auto]
Conguration options: [Auto] [3 DRAM Clock] [4 DRAM Clock] – [9 DRAM Clock] [10
DRAM Clock]
DRAM RAS# PRE Time [Auto]
Conguration options: [Auto] [3 DRAM Clock] [4 DRAM Clock] – [9 DRAM Clock] [10
DRAM Clock]
DRAM RAS# ACT Time [Auto]
Conguration options: [Auto] [3 DRAM Clock] [4 DRAM Clock] – [32 DRAM Clock] [31
DRAM Clock]
DRAM RAS# to RAS# Delay [Auto]
Conguration options: [Auto] [1 DRAM Clock] – [7 DRAM Clock]
DRAM REF Cycle Time [Auto]
Conguration options: [Auto] [30 DRAM Clock] [36 DRAM Clock]
[48 DRAM Clock] [60 DRAM Clock] [72 DRAM Clock] [82 DRAM Clock]
[88 DRAM Clock] [90 DRAM Clock] [100 DRAM Clock] [110 DRAM Clock]
DRAM WRITE Recovery Time [Auto]
Conguration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]
Chapter 3
DRAM READ to PRE Time [Auto]
Conguration options: [Auto] [1 DRAM Clock] – [15 DRAM Clock]
DRAM FOUR ACT WIN Time [Auto]
Conguration options: [Auto] [1 DRAM Clock] – [63 DRAM Clock]
2nd Information: 1N-44-0
The values vary depending on your settings of the following sub-items:
The following ten (10) items are adjusted by typing the desired values using the numeric
keypad and press the <Enter> key. You can also use the <+> and <-> keys to adjust the
value. To restore the default setting, type [auto] using the keyboard and press the <Enter>
key.
3.5.12 CPU Voltage Mode [Offset]
Allows you to set the CPU Voltage Mode. Different sub-items appear according to the CPU
Voltage Mode item setting. Conguration options: [Offset] [Manual]
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Offset Voltage [Auto]
This item appears only when you set the CPU Voltage Mode item to [Offset] and allows you
to set the Offset voltage. The values range from 0.00625V to 0.50000V with a 0.00625V
interval.
Offset Sign [-]
This item appears only when you set the Offset Voltage item to a value other than [Auto].
[+] To offset the voltage by a positive value.
[–] To offset the voltage by a negative value.
Fixed Voltage [Auto]
This item appears only whne you set the CPU Voltage Mode item to [Manual] and allows you
to set a xed CPU voltage. The values range from 0.85V to 1.70V with a 0.00625V interval.
3.5.13 IMC Voltage [Auto]
Allows you to set the CPU Integrated Memory Controller voltage. The values range from 1.1V
to 1.7 with a 0.0125V interval.
3.5.14 DRAM Voltage [Auto]
Allows you to set the DRAM voltage. The values range from 1.5V to 2.5V* with a 0.0125V
interval.
Chapter 3
Refer to the CPU documentation before setting the CPU Vcore voltage. Setting a high
VCore voltage may damage the CPU permanently, and setting a low VCore voltage may
make the system unstable.
• The value [2.5V] of the DRAM Voltage item is supported only if the OV_DRAM switch
is enabled. Otherwise the maximum voltage supported is [2.0V]. This item can be
automatically optimized if you install a XMP DIMM. See 2. DRAM overvoltage setting
on page 2-26 for details.
• According to Intel CPU spec, DIMMs with voltage requirement over 1.65V may
damage the CPU permanently. We recommend you install the DIMMs with the voltage
requirement below 1.65V.
3.5.15 CPU PLL Voltage [Auto]
Allows you to set the CPU PLL voltage. The values range from 1.8V to 2.1V with a 0.1V
interval.
3.5.16 PCH Voltage [Auto]
Allows you to set the Platform Controller Hub voltage. The values range from 1.05V to 1.15V
with a 0.10V interval.
• The values of the IMC Voltage, DRAM Voltage, and CPU PLL Voltage items are
labeled in different color, indicating the risk levels of high voltage settings. Refer to the
table below for details.
• The system may need better cooling system to work stably under high voltage
settings.
3-18Chapter 3: BIOS setup
Page 81
BlueYellowPurpleRed
IMC Voltage
DRAM Voltage
CPU PLL Voltage1.80V–1.90V2.00V–2.10VN/AN/A
1.10000V–
1.16875V
1.5000V–
1.5625V
1.17500V–
1.22500V
1.5750V–
1.6250V
1.23125V–
1.30000V
1.6375V–
1.6875V
1.30625V–
1.70000V
1.7000V–
2.5000V
3.5.17 DRAM DATA REF Voltage on CHA/B [Auto]
Allows you to set the DRAM DATA Reference Voltage on Channel A/B/C. The values
range from 0.395x to 0.630x with a 0.005x interval. Different ratio might enhance DRAM
overclocking ability.
3.5.18 DRAM CTRL REF Voltage on CHA/B [Auto]
Allows you to set the DRAM Control Reference Voltage on Channel A/B/C. The values
range from 0.395x to 0.630x with a 0.005x interval. Different ratio might enhance DRAM
overclocking ability.
[Disabled] Enhances the BCLK overclocking ability.
[Enabled] Sets to [Enabled] for EMI control.
3.5.21 PCIE Spread Spectrum [Auto]
[Auto] Automatic conguration.
[Disabled] Enhances the PCIE overclocking ability.
[Enabled] Sets to [Enabled] for EMI control.
ASUS P7P55D
Chapter 3
3-19
Page 82
3.6 Advanced menu
The Advanced menu items allow you to change the settings for the CPU and other system
devices.
Be cautious when changing the settings of the Advanced menu items. Incorrect eld values
can cause the system to malfunction.
Main Ai Tweaker Advanced Power Boot Tools Exit
CPU Conguration
North Bridge Conguration
Onboard Devices Conguration
USB Conguration
PCIPnP
Intel VT-d Conguration
T.Probe [Enabled]
3.6.1 CPU Conguration
The items in this menu show the CPU-related information that the BIOS automatically
detects.
Chapter 3
Advanced
Congure advanced CPU settings
Module Version:01.04
Manufacturer:Intel
Brand String:Genuine Intel(R) CPU
Frequency :2.66GHz
BCLK Speed :133MHz
Cache L1 :128 KB
Cache L2 :1024 KB
Cache L3 :8192 KB
Ratio Status:Unlocked (Min:09, Max:20)
Ratio Actual Value:20
CPU Ratio Setting [Auto]
C1E Support [Enabled]
Hardware Prefetcher [Enabled]
Adjacent Cache Line Prefetch [Enabled]
Max CPUID Value Limit [Disabled]
Intel(R) Virtualization Tech [Enabled]
CPU TM function [Enabled]
BIOS SETUP UTILITY
Congure CPU.
←→ Select Screen
↑↓ Select Item
Enter Go to Sub Screen
F1 General Help
F10 Save and Exit
ESC Exit
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
The items shown in this screen may be different due to the CPU you installed.
BIOS SETUP UTILITY
Sets the ratio between
CPU Core Clock and the
FSB Frequency.
NOTE: If an invalid
ratio is set in CMOS
then actual and
setpoint values may
differ.
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
3-20Chapter 3: BIOS setup
Page 83
CPU Ratio Setting [Auto]
Allows you to adjust the ratio between CPU Core Clock and BCLK Frequency. Use the <+>
and <-> keys to adjust the value. The valid value ranges differently according to your CPU
model.
C1E Support [Enabled]
[Enabled] Enables the C1E support function. This item should be enabled in order to
enable the Enhanced Halt Sate.
[Disabled] Disables this function.
Hardware Prefetcher [Enabled]
[Enabled] Enables the Hardware Prefetcher function. This item should be enabled
in order to enable the L2 cache (MLC) Streamer Prefetcher for tuning
performance of the specic application.
[Disabled] Disables this function.
Adjacent Cache Line Prefetcher [Enabled]
[Enabled] Enables the Adjacent Cache Line Prefetcher function. This item should be
enabled in order to enable the L2 cache (MLC) Spatial Prefetcher for tuning
performance of the specic application.
[Disabled] Disables this function.
Max CPUID Value Limit [Disabled]
[Enabled] Allows legacy operating systems to boot even without support for CPUs
with extended CPUID functions.
[Disabled] Disables this function.
Intel(R) Virtualization Tech [Enabled]
[Enabled] Allows a hardware platform to run multiple operating systems separately
and simultaneously, enabling one system to virtually function as several
systems.
[Disabled] Disables this function.
CPU TM function [Enabled]
[Enabled] Enables the overheated CPU to throttle its clock speed to cool down.
[Disabled] Disables this function.
Execute Disable Bit [Enabled]
[Enabled] Enables the No-Execution Page Protection Technology.
[Disabled] Forces the XD feature ag to always return to zero (0).
Intel(R) HT Technology [Enabled]
[Enabled] Enables the Intel Hyper-Threading Technology.
[Disabled] Only one thread per activated CPU core is enabled.
Chapter 3
ASUS P7P55D
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Active Processor Cores [All]
[All] Activate all CPU cores in the processor package.
[1] Activate only 1 CPU core in the processor package.
[2] Activate 2 CPU cores in the processor package.
A20M [Disabled]
[Enabled] Legacy OSes and APs may need this function enabled.
[Disabled] Disables this function.
Intel(R) SpeedStep (TM) Tech [Enabled]
[Enabled] The CPU speed is controlled by the operating system.
[Disabled] The CPU runs at its default speed.
Intel(R) TurboMode tech [Enabled]
[Enabled] Allows processor cores to run faster than marked frequency in specic
[Disabled] Disables this function.
Intel(R) C-STATE Tech [Disabled]
[Enabled] Allows the CPU to save more power under idle mode. Enable this item only
[Disabled] Disables this function.
C State package limit setting [Auto]
This item appears only when you set the Intel(R) C-STATE Tech item to [Enabled]. We
recommend that you set this item to [Auto] for BIOS to automatically detect the C-State mode
Chapter 3
supported by your CPU. Conguration options: [Auto] [C1] [C3] [C6] [C7]
condition.
when you install a C-State Technology-supported CPU.
3.6.2 North Bridge Conguration
The North Bridge menu allows you to change the advanced chipset settings.
Advanced
North Bridge Chipset Conguration
IMC Type : Havendale
Memory Remap Feature [Enabled]
PCI MMIO Allocation: 4GB To 3072MB
Memory Remap Feature [Enabled]
[Disabled] Do not allow remapping of memory.
[Enabled] Allows for the segment of system memory that was previously overwritten
by PCI devices to be remapped above the total physical memory.
3-22Chapter 3: BIOS setup
BIOS SETUP UTILITY
ENABLE: Allow
remapping of
overlapped PCI memory
above the total
physical memory.
DISABLE: Do not allow
remapping of memory.
Page 85
3.6.3 Onboard Device Conguration
Advanced
Onboard Devices Conguration
HDA Controller [Enabled]
Front Panel Type [HD Audio]
Realtek LAN [Enabled]
LAN Boot ROM [Disabled]
Onboard 1394 Controller [Enabled]
J-Micron eSATA/PATA Controller [IDE Mode]
Serial Port1 Address [3F8/IRQ4]
BIOS SETUP UTILITY
Enabled
Disabled
Options
HDA Controller [Enabled]
[Enabled] Enables the High Denition Audio Controller.
[Disabled] Disables the controller.
Front Panel Type [HD Audio]
[AC97] Set the front panel audio connector (AAFP) mode to legacy AC’97
[HD Audio] Set the front panel audio connector (AAFP) mode to high-denition audio.
Realtek LAN [Enabled]
[Enabled] Enables Realtek LAN Controller.
[Disabled] Disables Realtek LAN Controller.
LAN Boot ROM [Disabled]
This item appears only when you enable the previous item(s).
[Disabled] Disables Realtek LAN Boot ROM.
[Enabled] Enables Realtek LAN Boot ROM.
Onboard 1394 Controller [Enabled]
[Enabled] Enables the onboard 1394 Controller.
[Disabled] Disables the controller.
J-Micron eSATA/PATA Controller [IDE]
[Disabled] Disables the J-Micron controller.
[IDE Mode] Set to [IDE Mode] when you want to use the Serial ATA hard disk drives as
Parallel ATA physical storage devices.
[AHCI Mode] Set to [AHCI] when you want the SATA hard disk drives to use the AHCI
(Advabced Host Controller Interface). The AHCI allows the onboard storage
driver to enable advanced Serial ATA features that increases storage
performance on random workloads by allowing the drive to internally
optimize the order of commands.
Serial Port1 Address [3F8/IRQ4]
Allows you to select the Serial Port1 base address.
The items in this menu allows you to change the USB-related features. Select an item then
press <Enter> to display the conguration options.
Advanced
USB Conguration
Module Version - 2.24.3-13.4
USB Devices Enabled:
2 Hubs
USB Functions [Enabled]
Legacy USB Support [Auto]
BIOS EHCI Hand-Off [Enabled]
USB Support [Enabled]
[Enabled] Enables the USB Host Controllers.
[Disabled] Disables the controllers.
Legacy USB Support [Enabled]
[Disabled] Disables the function.
[Enabled] Enables the support for USB devices on legacy operating systems (OS).
[Auto] Allows the system to detect the presence of USB devices at startup. If
Chapter 3
BIOS EHCI Hand-off [Enabled]
[Disabled] Disables the function.
[Enabled] Enables the support for operating systems without an EHCI hand-off
BIOS SETUP UTILITY
Options
Disabled
Enabled
The USB Devices Enabled item shows the auto-detected values. If no USB device is
detected, the item shows None.
The following items appear only when you set USB Support to [Enabled].
detected, the USB controller legacy mode is enabled. If no USB device is
detected, the legacy USB support is disabled.
feature.
3-24Chapter 3: BIOS setup
Page 87
3.6.5 PCIPnP
The PCIPnP menu items allow you to change the advanced settings for PCI/PnP devices.
Advanced
Advanced PCI/PnP Settings
WARNING: Setting wrong values in below sections
may cause system to malfunction.
Plug And Play O/S [No]
BIOS SETUP UTILITY
NO: lets the BIOS
congure all the
devices in the
system.
Plug And Play O/S [No]
[Yes] When set to [Yes] and if you install a Plug and Play operating system, the
[No] When set to [No], BIOS congures all the devices in the system.
operating system congures the Plug and Play devices not required for
boot.
3.6.6 Intel VT-d Conguration [Disabled]
[Disabled] Disables the Intel Virtualization Technology for Directed I/O.
[Enabled] Enables the Intel Virtualization Technology for Directed I/O.
3.6.7 T.Probe [Enabled]
[Disabled] Disables the T.Probe Functions.
[Enabled] Enables the T.Probe Functions that detect and equalize the temperature of
vCore power components.
3.7 Power menu
The Power menu items allow you to change the settings for the Advanced Power
Management (APM). Select an item then press <Enter> to display the conguration options.
Main Ai Tweaker Advanced Power Boot Tools Exit
Suspend Mode [Auto]
Repost Video on S3 Resume [No]
ACPI 2.0 Support [Disabled]
ACPI APIC Support [Enabled]
EuP Ready [Disabled]
APM Conguration
Hardware Monitor
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
ASUS P7P55D
BIOS SETUP UTILITY
Select the ACPI state
used for System
Suspend.
←→ Select Screen
↑↓ Select Item
+- Change Option
F1 General Help
F10 Save and Exit
ESC Exit
Chapter 3
3-25
Page 88
3.7.1 Suspend Mode [Auto]
Allows you to select the Advanced Conguration and Power Interface (ACPI) state to be used
for system suspend.
[S1 (POS) only] Sets the APCI suspend mode to S1/POS (Power On Suspend).
[S3 only] Sets the APCI suspend mode to S3/STR (Suspend To RAM).
[Auto] The system automatically congures the ACPI suspend mode.
3.7.2 Repost Video on S3 Resume [No]
Determines whether to invoke VGA BIOS POST on S3/STR resume.
[No] The system will not invoke VGA BIOS POST on S3/STR resume.
[Yes] The system invokes VGA BIOS POST on S3/STR resume.
3.7.3 ACPI 2.0 Support [Disabled]
[Disabled] When set to [Disabled], the system will not add additional tables as per
[Enabled] When set to [Enabled], the system adds additional tables as per ACPI 2.0
ACPI 2.0 specications.
specications.
3.7.4 ACPI APIC Support [Enabled]
[Disabled] When set to [Disabled], the system disable the Advanced Conguration and
[Enabled] When set to [Enabled], the ACPI APIC table pointer is included in the RSDT
Power Interface (ACPI) support in the Advanced Programmable Interrupt
Controller (APIC).
pointer list.
Chapter 3
3.7.5 EuP Ready [Disabled]
[Disabled] Disables the Energy Using Products (EuP) Ready function.
[Enabled] Allows the BIOS to switch off power for WOL, WO_USB, audio, and
onboard LEDs at S5 state to get the system ready for the EuP requirement.
3-26Chapter 3: BIOS setup
Page 89
3.7.6 APM Conguration
Power
APM Conguration
Restore on AC Power Loss [Power Off]
Power On By RTC Alarm [Disabled]
Power On By External Modems [Disalbed]
Power On By PCI Devices [Disabled]
Power On By PCIE Devices [Disabled]
Power On By PS/2 Keyboard[Disabled] PS/2 Keyboard [Disabled]
Power On By PS/2 Mouse[Disabled] PS/2 Mouse [Disabled]
BIOS SETUP UTILITY
<Enter> to select
whether or not to
restart the system
after AC power loss.
Restore On AC Power Loss [Power Off]
[Power Off] The system goes into off state after an AC power loss.
[Power On] The system goes into on state after an AC power loss.
[Last State] The system goes into either off or on state, whatever the system state was
before the AC power loss.
Power On By RTC Alarm [Disabled]
[Disabled] Disables RTC to generate a wake event.
[Enabled] When set to [Enabled], the items RTC Alarm Date (Days) / System Time
will become user-congurable with set values.
Power On By External Modems [Disabled]
[Disabled] Disables to power up the computer when the external modem receives a
[Enabled] The computer could be powered up when the external modem receives a
call while the computer is in Soft-off mode.
call while the computer is in Soft-off mode.
The computer cannot receive or transmit data until the computer and applications are fully
running. Thus, connection cannot be made on the rst try. Turning an external modem
off and then back on while the computer is off causes an initialization string that turns the
system power on.
Power On By PCI Devices [Disabled]
[Disabled] Disables the PME to wake up from S5 by PCI devices.
[Enabled] Allows you to turn on the system through a PCI LAN or modem card. This
feature requires an ATX power supply that provides at least 1A on the
+5VSB lead.
Power On By PCIE Devices [Disabled]
Allows you to enable or disable the PCIE devices to generate a wake event.
[Disabled] Disables the PCIE devices to generate a wake event.
[Enabled] Enables the PCIE devices to generate a wake event.
Power On By PS/2 Keyboard [Disabled]
[Disabled] Disables the Power On by a PS/2 keyboard.
[Enabled] Sets specic keys on the PS/2 keyboard to turn on the system. This feature
requires an ATX power supply that provides at least 1A on the +5VSB lead.
ASUS P7P55D
Chapter 3
3-27
Page 90
Power On By PS/2 Mouse [Disabled]
[Disabled] Disables the Power On by a PS/2 mouse.
[Enabled] Enables the Power On by a PS/2 mouse. This feature requires an ATX
3.7.7 Hardware Monitor
Power
Hardware Monitor
CPU Temperature [35ºC/95ºF]
MB Temperature [34ºC/93ºF]
CPU Fan Speed [3590RPM]
CPU Q-Fan Control [Disabled]
Chassis Fan 1 Speed [N/A]
Chassis Fan 2 Speed [N/A]
Chassis Q-Fan Control [Disabled]
Power Fan Speed [N/A]
CPU Voltage [ 1.040V]
3.3V Voltage [ 3.008V]
5V Voltage [ 4.776V]
12V Voltage [11.648V]
CPU/MB Temperature [xxxºC/xxxºF][xxxºC/xxxºF]
The onboard hardware monitor automatically detects and displays the CPU and motherboard
temperatures. Select Ignored if you do not wish to display the detected temperatures.
CPU Fan Speed [xxxxRPM] or [Ignored] / [N/A]
Chapter 3
Chassis Fan 1/2 Speed [xxxxRPM] or [Ignored] / [N/A]
Power Fan Speed [xxxxRPM] or [Ignored] / [N/A]
The onboard hardware monitor automatically detects and displays the CPU, chassis,
and power fan speed in rotations per minute (RPM). If the fan is not connected to the fan speed in rotations per minute (RPM). If the fan is not connected to the
motherboard, the eld shows N/A. Select Ignored if you do not wish to display the detected
speed.
power supply that provides at least 1A on the +5VSB lead.
BIOS SETUP UTILITY
CPU Temperature(PECI)
CPU Q-Fan Control [Disabled]
[Disabled] Disables the CPU Q-Fan control feature.
[Enabled] Enables the CPU Q-Fan control feature.
CPU Fan Profile [Standard]
This item appears only when you enable the CPU Q-Fan Control feature and allows
you to set the appropriate performance level of the CPU fan.
[Standard] Sets to [Standard] to make the CPU fan automatically adjust depending on
[Silent] Sets to [Silent] to minimize the fan speed for quiet CPU fan operation.
[Turbo] Set to [Turbo] to achieve maximum CPU fan speed.
3-28Chapter 3: BIOS setup
the CPU temperature.
Page 91
Chassis Q-Fan Control [Disabled]
[Disabled] Disables the Chassis Q-Fan control feature.
[Enabled] Enables the Chassis Q-Fan control feature.
Chassis Fan Profile [Standard]
This item appears only when you enable the Chassis Q-Fan Control feature and
allows you to set the appropriate performance level of the chassis fan.
[Standard] Sets to [Standard] to make the chassis fan automatically adjust depending
on the chassis temperature.
[Silent] Sets to [Silent] to minimize the fan speed for quiet chassis fan operation.
[Turbo] Set to [Turbo] to achieve maximum chassis fan speed.
CPU Voltage, 3.3V Voltage, 5V Voltage, 12V Voltage
The onboard hardware monitor automatically detects the voltage output through the onboard
voltage regulators. Select Ignored if you do not want to detect this item.
3.8 Boot menu
The Boot menu items allow you to change the system boot options. Select an item then press
<Enter> to display the submenu.
Main Ai Tweaker Advanced Power Boot Tools Exit
Boot Settings
Boot Device Priority
Boot Settings Conguration
Security
BIOS SETUP UTILITY
Species the Boot
Device Priority
sequence.
A virtual oppy disk
drive (Floppy Drive B:
) may appear when you
set the CD-ROM drive
as the rst boot
device.
←→ Select Screen
↑↓ Select Item
Enter Go to Sub Screen
F1 General Help
F10 Save and Exit
ESC Exit
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
These items specify the boot device priority sequence from the available devices. The
number of device items that appears on the screen depends on the number of devices
installed in the system.
Quick Boot [Enabled]
Full Screen Logo [Enabled]
AddOn ROM Display Mode [Force BIOS]
Bootup Num-Lock [On]
Wait For ‘F1’ If Error [Enabled]
Hit ‘DEL’ Message Display [Enabled]
POST State LEDs [Enabled]
Quick Boot [Enabled]
[Disabled] When set to [Disabled], BIOS performs all the POST items.
[Enabled] When set to [Enabled], BIOS skips some power on self tests (POST) while
Full Screen Logo [Enabled]
[Disabled] Disables the full screen logo display feature.
[Enabled] Enables the full screen logo display feature.
AddOn ROM Display Mode [Force BIOS]
[Force BIOS] The third-party ROM messages will be forced to display during the boot
[Keep Current] The third-party ROM messages will be displayed only if the third-party
Chapter 3
Bootup Num-Lock [On]
[Off] Sets the power-on state of the NumLock to [Off].
[On] Sets the power-on state of the NumLock to [On].
Wait For ‘F1’ If Error [Enabled]
[Disabled] Disables this function.
[Enabled] The system waits for the <F1> key to be pressed when error occurs.
Hit ‘DEL’ Message Display [Enabled]
[Disabled] Disables this function.
[Enabled] The system displays the message “Press DEL to run Setup” during POST.
POST State LEDs [Enabled]
[Enabled] Turn on onboard device LEDs in the order of the device POST sequence.
[Disabled] Disables this function.
BIOS SETUP UTILITY
Allows BIOS to skip
certain tests while
booting. This will
decrease the time
needed to boot the
system.
booting to decrease the time needed to boot the system.
Set this item to [Enabled] to use the ASUS MyLogo 2™ feature.
sequence.
manufacturer had set the add-on device to do so.
3-30Chapter 3: BIOS setup
Page 93
3.8.3 Security
The Security menu items allow you to change the system security settings. Select an item
then press <Enter> to display the conguration options.
Boot
Security Settings
Supervisor Password : Not Installed
User Password : Not Installed
Change Supervisor Password
Change User Passward
Change Supervisor Password
Select this item to set or change the supervisor password. The Supervisor Password item
on top of the screen shows the default Not Installed. After you set a password, this item
shows Installed.
To set a Supervisor Password:
1. Select the Change Supervisor Password item and press <Enter>.
2. In the password box, key in a password containing up to six letters or numbers, or both,
then press <Enter>.
3. Conrm the password when prompted.
The message Password Installed appears after you successfully set your password.
To change the supervisor password, follow the same steps as in setting a user password.
To clear the supervisor password, select the Change Supervisor Password then press
<Enter>. The message Password Uninstalled appears.
If you forget your BIOS password, you can clear clear it by erasing the CMOS Real Time
Clock (RTC) RAM. See section 2.6 Jumpers for information on how to erase the RTC
RAM.
BIOS SETUP UTILITY
<Enter> to change
password.
<Enter> again to
disable password.
After you have set a supervisor password, the other items appear to allow you to change
other security settings.
ASUS P7P55D
Chapter 3
3-31
Page 94
Boot
Security Settings
Supervisor Password : Installed
User Password : Installed
Change Supervisor Password
User Access Level [Full Access]
Change User Password
Clear User Password
Password Check [Setup]
User Access Level [Full Access]
This item allows you to select the access restriction to the Setup items.
[No Access] Prevents user access to the Setup utility.
[View Only] Allows access but does not allow change to any eld.
[Limited] Allows changes only to selected elds, such as Date and Time.
[Full Access] Allows viewing and changing all the elds in the Setup utility.
Change User Password
Select this item to set or change the user password. The User Password item on top of the
screen shows the default Not Installed. After you set a password, this item shows Installed.
To set a User Password:
1. Select the Change User Password item and press <Enter>.
2. In the password box, key in a password containing up to six letters or numbers, orIn the password box, key in a password containing up to six letters or numbers, or
both, then press <Enter>.
3. Conrm the password when prompted.
Chapter 3
The message Password Installed appears after you set your password successfully.
To change the user password, follow the same steps as in setting a user password.
BIOS SETUP UTILITY
<Enter> to change
password.
<Enter> again to
disabled password.
Clear User Password
Select this item to clear the user password.
Password Check [Setup]
[Setup] BIOS checks for user password when accessing the Setup utility.
[Always] BIOS checks for user password both when accessing Setup and booting
3-32Chapter 3: BIOS setup
the system.
Page 95
3.9 Tools menu
The Tools menu items allow you to congure options for special functions. Select an item
then press <Enter> to display the submenu.
Main Ai Tweaker Advanced Power Boot Tools Exit
ASUS O.C. Prole
AI NET 2
ASUS EZ Flash 2
Express Gate [Auto]
Enter OS Timer [10 Seconds]
Reset User Data [No]
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
3.9.1 ASUS O.C. Prole
This item allows you to store or load multiple BIOS settings.
Tools
O.C. PROFILE Conguration
O.C. Prole 1 Status : Not Installed
O.C. Prole 2 Status : Not Installed
O.C. Prole 3 Status : Not Installed
O.C. Prole 4 Status : Not Installed
O.C. Prole 5 Status : Not Installed
O.C. Prole 6 Status : Not Installed
O.C. Prole 7 Status : Not Installed
O.C. Prole 8 Status : Not Installed
Status:
Add Your CMOS Prole.
Name: [Default-Prole]
Save To: [Uninstalled]
Load CMOS Proles.
Load From: [Blank]
Start O.C. Prole
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
BIOS SETUP UTILITY
BIOS SETUP UTILITY
←→ Select Screen
↑↓ Select Item
Enter Go to Sub Screen
F1 General Help
F10 Save and Exit
ESC Exit
Typing your prole
name, [0-9][a-z][A-Z]
are acceptable.
←→ Select Screen
↑↓ Select Item
F1 General Help
F10 Save and Exit
ESC Exit
Chapter 3
Add Your CMOS Prole
Allows you to save the current BIOS le to the BIOS Flash. In the Name sub-item, type your
prole name and press <Enter>, and then choose a prole number to save your CMOS
settings in the Save to sub-item.
Load CMOS Proles
Allows you to load the previous BIOS settings saved in the BIOS Flash. Press <Enter>, and
choose a prole to load.
Start O.C. Prole
Allows you to run the utility to save and load CMOS. Press <Enter> to run the utility.
ASUS P7P55D
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ASUSTek O.C. Prole Utility V4.00a
3.9.2 AI NET 2
Chapter 3
Tools
AI NET 2
Pair Status Length
Check Realtek LAN cable [Disabled]
Current CMOS
BOARD: P7P55D
VER: 0157
DATE: 06/19/2009
PATH: A:\
A:
Note
[Enter] Select or Load [Tab] Switch [V] Drive Info
[Up/Down/Home/End] Move [B] Backup [Esc] Exit
Restore CMOS
BOARD: Unknown
VER: Unknown
DATE: Unknown
• This function can support devices such as a USB ash disk with FAT 32/16 format and
single partition only.
• DO NOT shut down or reset the system while updating the BIOS to prevent the
system boot failure!
• We recommend that you update the BIOS le only coming from the same memory/CPU
conguration and BIOS version.
• Only the CMO le can be loaded.
BIOS SETUP UTILITY
Check Realtek LAN
cable during POST.
It will take 3 to 10
seconds to diagnose
LAN cable.
Check Realtek LAN Cable [Disabled]
[Disabled] BIOS will not check the Realtek LAN cable during the Power-On Self-Test
[Enabled] BIOS checks the Realtek LAN cable during the Power-On Self-Test
(POST).
(POST).
3.9.3 ASUS EZ Flash 2
Allows you to run ASUS EZ Flash 2. When you press <Enter>, a conrmation message
appears. Use the left/right arrow key to select between [Yes] or [No], then press <Enter> to
conrm your choice. Check section 3.2.2 ASUS EZ Flash 2 utility for details.
3-34Chapter 3: BIOS setup
Page 97
3.9.4 Express Gate [Auto]
Allows you to enable or disable the ASUS Express Gate feature. The ASUS Express Gate
feature is a unique instant-on environment that provides quick access to the Internet browser
and Skype. Conguration options: [Enabled] [Disabled] [Auto]
Enter OS Timer [10 Seconds]
Sets countdown duration that the system waits at the Express Gate’s rst screen
before starting Windows or other installed OS. Choose [Prompt User] to stay at the rst
screen of Express Gate for user action.
Conguration options: [Prompt User] [1 second] [3 seconds] [5 seconds] [10 seconds][10 seconds]
[15 seconds] [20 seconds] [30 seconds]
Reset User Data [No]
Allows you to clear Express Gate’s user data.
[Reset] When setting this item to [Reset], ensure that you save the setting to the
[No] Set to [No] to disable the Reset User Data function when entering the
BIOS so that the user data will be cleared the next time you enter the
Express Gate. User data includes the Express Gate’s settings as well as
any personal information stored by the web browser such as bookmarks,
cookies, browsing history. This is useful in the rare case where corrupt
settings prevent the Express Gate environment from launching properly.
Express Gate.
The rst time wizard will run again when you enter the Express Gate environment after
clearing its settings.
ASUS P7P55D
Chapter 3
3-35
Page 98
3.10 Exit menu
The Exit menu items allow you to load the optimal or failsafe default values for the BIOS
items, and save or discard your changes to the BIOS items.
Main Ai Tweaker Advanced Power Boot Tools Exit
Exit Options
Exit & Save Changes
Exit & Discard Changes
Discard Changes
Load Setup Defaults
Exit & Save Changes
Once you are nished making your selections, choose this option from the Exit menu to
ensure the values you selected are saved to the CMOS RAM. An onboard backup battery
sustains the CMOS RAM so it stays on even when the PC is turned off. When you select this
option, a conrmation window appears. Select Ok to save changes and exit.
Chapter 3
BIOS SETUP UTILITY
Exit system setup
after saving the
changes.
F10 key can be used
for this operation.
←→ Select Screen
↑↓ Select Item
Enter Go to Sub Screen
F1 General Help
F10 Save and Exit
ESC Exit
v02.61 (C)Copyright 1985-2009, American Megatrends, Inc.
Pressing <Esc> does not immediately exit this menu. Select one of the options from this
menu or <F10> from the legend bar to exit.
If you attempt to exit the Setup program without saving your changes, the program prompts
you with a message asking if you want to save your changes before exiting. Press <Enter>
to save the changes while exiting.
Exit & Discard Changes
Select this option only if you do not want to save the changes that you made to the
Setup program. If you made changes to elds other than System Date, System Time, and
Password, the BIOS asks for a conrmation before exiting.
Discard Changes
This option allows you to discard the selections you made and restore the previously saved
values. After selecting this option, a conrmation appears. Select Ok to discard any changes
and load the previously saved values.
Load Setup Defaults
This option allows you to load the default values for each of the parameters on the Setup
menus. When you select this option or if you press <F5>, a conrmation window appears.
Select Ok to load default values. Select Exit & Save Changes or make other changes before
saving the values to the non-volatile RAM.
3-36Chapter 3: BIOS setup
Page 99
Chapter 4
Chapter 4: Software support
4.1 Installing an operating system
This motherboard supports Windows® XP/ 64-bit XP/ Vista / 64-bit Vista / 7 / 64-bit 7
operating systems (OS). Always install the latest OS version and corresponding updates to
maximize the features of your hardware.
• Motherboard settings and hardware options vary. Use the setup procedures presented
in this chapter for reference only. Refer to your OS documentation for detailed
information.
• Ensure that you install the Windows® XP Service Pack 2 or later versions before
installing the drivers for better compatibility and system stability.
4.2 Support DVD information
The support DVD that comes with the motherboard package contains the drivers, software
applications, and utilities that you can install to avail all motherboard features.
The contents of the support DVD are subject to change at any time without notice. Visit the
ASUS website at www.asus.com for updates.
4.2.1 Running the support DVD
Place the support DVD into the optical drive. The DVD automatically displays the Drivers menu if
Autorun is enabled in your computer. Click each menu tab and select the items you want to install.
The Drivers menu shows the available
device drivers if the system detects
installed devices. Install the necessary
menu shows the
applications and
other software that
the motherboard
ASUS P7P55D
drivers to use the devices.
The Utilities
supports.
Click an item
to install
If Autorun is NOT enabled in your computer, browse the contents of the support DVD to
locate the le ASSETUP.EXE from the BIN folder. Double-click the ASSETUP.EXE to run
the DVD.
The Make disk menu
contains items to
create the RAID/AHCI
driver disk.
The Manual menu contains
the list of supplementary user
manuals. Click an item to open
the folder of the user manual.
Click the Contact
tab to display the
ASUS contact
information.
Click an icon
to display DVD/
motherboard
information
4-1
Page 100
4.2.2 Obtaining the software manuals
The software manuals are included in the support DVD. Follow the instructions below to get
the necessary software manuals.
The software manual les are in Portable Document Format (PDF). Install the Adobe®
Acrobat® Reader from the Utilities menu before opening the les.
1. Click the support DVD icon.
2. The support DVD contents are
displayed in graphical format.
Double-click the Manual folder.
3. Double-click the folder of your
selected manual.
Chapter 4
The screenshots in this section are for reference only. The actual software manuals
containing in the support DVD vary by models.
4-2Chapter 4: Software support
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