Intel CW8064701471001 User Manual

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Overclocking Unlocked Intel® CoreProcessors for High Performance Gaming and Content Creation

Michael Moen – Sr. System Engineer, Intel Corporation Dan Ragland – Sr. System Engineer, Intel Corporation JJ Guerrero – Sr. Technical Marketing Specialist, Asus

AIOS001

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 may: (i) reduce system stability and useful life 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 data integrity. Intel has not tested, and does not warranty, the operation of the processor beyond its specifications. Intel assumes no responsibility that the 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

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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

4

Defining Overclocking

What is Overclocking (OC)?

The process of increasing clock rates beyond specification

Why Overclock?

Increase performance for compute intensive tasks, e.g., transcode, gaming, rendering

Compete, Promote, Socialize

How is this done?

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

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Overclocking Theory

General Principles

The Rule: Maximize frequency, minimize voltage/current and

maximize heat dissipation to meet personal stability requirements

What

Benefits

How

 

Processor

Rendering, Music, Photo

Increase Power Limits and Max

Increasing

Cores

and Video editing,

Current

 

Transcode, Gaming

Raise Core voltage

 

 

 

Physics, AI, Compute

Increase active Core ratios

 

 

Intensive

 

 

Processor

Gaming frame rates,

Increase Power Limits and Max

 

Integrated

Media Transcode

Current

Complexity

Graphics

and Video editing

Raise pGfx voltage

(pGfx)

Increase system agent voltage

 

Raise pGfx max ratio

 

Memory

Processor Graphics

Increase memory ratio

 

 

performance,

Raise memory IO voltage

 

 

Sound engineering, Photo

Change timings

 

 

 

 

 

Platform

All of the above

Increase all domain voltages

 

Base Clock

 

Reduce weakest domain

 

 

 

frequency via ratios

 

† pGfx utilizes Intel® Iris™ Pro., Intel® Iris , or Intel® HD Graphics

 

 

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Observed Frequency Trends in OC

Q: How much OC can I expect from my CPU?

A:There are many factors

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

HEDT = High End Desktop. Today this includes Socket LGA2011.

This data was collected from overclocking forums and should be considered approximate for illustrative purposes only.

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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

8

Intel® Corei7 Desktop Processors Based on

Socket LGA2011 with Intel® X79 Express Chipset

Processor Memory

1 2 3 M Memory

4 5 6

C

PCIE

DMICLK

R

×1

P PEG

DDMI

DMI

DB1200

~ CK505

CCore Frequency

Unlocked Intel® Turbo Boost Technology limits

Unlocked core ratios up to 63 in 100MHz increments

Programmable voltage offset

M• Memory Ratio

Unlocked memory controller

Granularity in 266MHz steps

Ratios supported up to 2400Hz

• DMICLK (aka BCLK)

– Fine Grain range ± 5-7%

R – BCLK ratios = 1.0, 1.25, 1.67

• PEG and DMI Ratios

P D – PEG/DMI ratios = 80/50, 64/40, 48/30

Ratio option must reflect selected BCLK coarse ratio

Example : Core Freq x 1.25 R requires PEG/DMI ratios P D at 64/40 x 1.25 R to keep at 8 GHz/5 GHz nominal

9 Only some processors enable part or all of these features. Consult processor documentation for details.

Intel® Corei7 Desktop Processors Based on Socket LGA2011 with Intel® X79 Express Chipset

Feature Overview

SKU

Cores/Cache

Turbo Ratio Overrides (100MHz

Steps)

PL1, PL2, Tau, ICCMax Overrides

Real-time Core Overclocking (in

OS)

DDR Frequency Overrides

(266MHz Steps)

DDR Timing Overrides

Coarse BCLK Ratios supported with PEG, DMI ratios

i7-4960X

i7-4930K

i7-4820K

6/15M

6/12M

4/10M

Up to 63

Up to 63

Up to 63

Yes

Yes

Yes

Up to 2400

Up to 2400

Up to 2400

Enhanced Ratio

Enhanced Ratio

Enhanced Ratio

Support (1.0,

Support (1.0,

Support (1.0,

1.25, 1.67)

1.25, 1.67)

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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