Intel CW8064701471001 User Manual
Overclocking Unlocked Intel
™
Core
Processors for High
Performance Gaming and
Content Creation
Michael Moe n – Sr. System Enginee r, Intel Corporation
Dan Ragland – Sr. System Engineer, Int e l Corpor a tion
®
JJ Guerrero – Sr. Technical Marke ti ng Spe ci al ist, Asus
AIOS001
1
Agenda
• Overclocking Theory and Trends
• High-end Desktop Overclocking Architecture
• Overclocking Design Tips
• Desktop and Mobile Overclocking Architecture
• Harnessing Overclocking
• Summary
2
Risk Reminder
WARNING: Altering clock frequency and/or voltage
ma y: (i) reduce system stabi li ty and useful l ife of the
system and processor; (ii) cause the processor and other
system components to fail; (iii) cause reductions in system
performance; (iv) cause additional heat or other damage; and
(v) affect system d ata integrity. Intel has not tested, and does
not warranty, the operation of the processor beyond its
specifications. Intel assumes no r esponsibi li ty that the
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processor, including if used with altered clock frequencies
and/or voltages, will be fit for any particular purpose. For more
information, visit:
http://www.intel.com/consumer/game/gaming-power.htm
Agenda
• Overclocking Theory and Trends
• High-end Desktop Overclocking Architecture
• Overclocking Design Tips
• Desktop and Mobile Overclocking Architecture
• Harnessing Overclocking
• Summary
4
Defining Overclocking
• What is Overclockin g (OC)?
– The process of increa si ng cl o ck rates beyond
specification
• Why Overclock?
– Increase performance for compute intensive tasks,
e.g., transc ode, ga ming , renderi ng
– Compete, Promote, Socialize
• How is this done?
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– Obtain a motherboard optimized for Intel® unlocked
processors
– Change unlocked ratios or platform clock frequency
– Increase voltage on relevant interfaces
– Improve cooling on overclocked/overvoltaged
components
Overclocking Theory
General Principles
The Rule: Maximize frequency, mini mize voltage/current and
maximize heat dissipation to meet personal stability requirements
What Benefits How
Processor
Cores
Processor
Integrated
Graphics
(pGfx)
Memory Processor Graphics
Platform
Base Clock
†
Rendering, Music, Photo
and Video editing,
Transcode, Gaming
Physics, AI, Compute
Intensive
Gaming frame rates,
Media Transcode
performance,
Sound engineering, Photo
and Video ed it ing
All of the above Increase all domain voltages
Increase Power Limits and Max
Current
Raise Core voltage
Increase active Core ratios
Increase Power Limits and Max
Current
Raise pGfx voltage
Raise pGfx max ratio
Increase memory ratio
Raise memory IO voltage
Change timings
Increase system agent voltage
Reduce weakest domain
Increasing Comp le xity
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frequency via ratios
† pGfx utilizes Intel® Iris™ Pro., Intel® Iris , or Intel® HD Graphics
Observed Frequency Trends in OC
Q: How much OC can I expect from my CPU?
A: There are many fac tors
– Every CPU is designed to meet nominal requirements with
intentional guardband – not specifically for OC
– Overclocking is the act of tapping into the intentional guardband
+ design conservatism + Si process conservatism
– This changes with each CPU process stepping, architecture change
and overall design targets
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HEDT = High End Desktop. Today th is includes Socket LGA2011.
This data was collecte d from overclocking forums and should be considered approximate for illustrative purposes only.
Agenda
• Overclocking Theory and Trends
• High-end Desktop Overclocking Architecture
• Overclocking Design Tips
• Desktop and Mobile Overclocking Architecture
• Harnessing Overclocking
• Summary
8
Intel® Core™ i7 Desktop Processors Based on Socket LGA2011 with Intel® X79 Express Chipset
C
• Core Frequency
DMICLK
DB1200
Processor
1 2
4 5
R
×1
3
6
C
Memory
Memory
M
PCIE
PEG
P
DMI
D
DMI
M
R
P D
– Unlocked Intel® Turbo Boost
Technology limits
†
– Unlocked core ratios up to 63 in
†
100MHz increments
– Programmable voltage offset
• Memory Ratio
– Unlocked memory controller
– Granularity in 266MHz steps
– Ratios supported up to 2400Hz
• DMICLK (aka BCLK)
– Fine Grain range ± 5-7%
– BCLK ratios = 1.0, 1.25, 1.67
• PEG and DMI Ratios
– PEG/DMI ratios = 80/50, 64/40,
48/30
CK505
~
Example : Core Freq x 1.25 requires PEG/DMI ratios
at 64/40 x 1.25 to keep at 8 GHz/5 GHz nominal
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† Only some processors enable par t or all of these features. Consult pro c e s s or documentation f or details.
R
R
– Ratio option must reflect selected
BCLK coarse ratio
P
D
Intel® Core™ i7 Desktop Processors Based on
Socket LGA2011 with Inte l® X79 Express Chipset
Feature Overview
SKU i7-4960X i7-4930K i7-4820K
Cores/Cache 6/15M 6/12M 4/10M
Turbo Ratio Overrides (100MHz
Steps)
†
Up to 63
Up to 63
Up to 63
PL1, PL2, Tau, ICCMax Overrides √ √ √
Real-time Core Overclocking (in
OS)
DDR Frequency Overrides
Up to 2400
Yes
Up to 2400
Yes
Yes
Up to 2400
(266MHz Steps)
DDR Timing Overrides √ √ √
Enhanced Ratio
Enhanced Ratio
Enhanced Ratio
Coarse BCLK Ratios supported
with PEG, DMI ratios
Support (1.0,
1.25, 1.67)
Support (1.0,
1.25, 1.67)
Support (1.0,
1.25, 1.67)
† Memory ratio not fuse limited, but support above 2400 via ratio not
guaranteed. Use BCLK for higher frequencies.
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Agenda
• Overclocking Theory and Trends
• High-end Desktop Overclocking Architecture
• Overclocking Design Tips
• Desktop and Mobile Overclocking Architecture
• Harnessing Overclocking
• Summary
11
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