Heya folks,

I'd like to add a small addendum to an already quite extensive list of OC setups and methods available here and the forums.


I've had a fair bit of struggle trying to get into overclocking, and have been scouring the web including this community site to learn about the steps involved in a successful configuration, which in my impatience means a stable OS environment that can withstand one cycle of Intel Burn Test. After a while, my search narrowed to just identifying and inputting values into respective bios entries, to ascertain that the base set of settings for a simple overclock is sound before attempting anything more complicated.

Then I have come upon this Youtube video of a ROG representative going into depth explaining overclocking setup for their X79 boards.

ASUS: How to Overclock an Intel X79 SandyBridge-E Motherboard

At the very least, it allowed me to get past the dreaded cold boot problem that I was having, and I would like to deliver the settings that were tweaked for those who would just want to try the values without watching the entire hour of video. But I'd suggest you do if you want the background info on what each entry means.

I'd like to mention the board I'm using is Sabertooth X79 motherboard with recent 3009 bios update. The CPU overclocked is i7 3820.

First order of things is to make sure the initial setup of your PC goes smoothly, with all settings as they are at default. I'd run a few benchmarks and even some games to ascertain whether there is any problem before delving into any overclocking tweaks.

If your PC system is stable, then it is time to enter into the bios. Restart the computer and press DEL or F2 at the splash image to enter into bios interface.

The default BIOS screen will be set to simplified interface. Press F7 to enter into Advanced Mode.

In Advanced Mode, you will notice the tabs on the top of the interface. They are, from left to right, Main, Ai Tweaker, Advanced, Monitor, Boot, and Tool. Click on Ai Tweaker.

Ai Overclock Tuner:

set to 'Manual'

XMP allows automatic settings to memory timings, but may be too aggressive


set to default, which is 100.000. Do not raise this value over 103.00

CPU Strap:

set to 125MHz

Memory Frequency:

It is recommended to keep the memory at its rated speeds, especially for denser memory modules.

You can go into shortcuts by pressing 'F3' and check out the SPD information on your memory modules

Turbo Ratio:

Per Core option allows overclocking flexibility for applications that use few cores but for my purposes, I left it at 'By All Cores'


DRAM Timing Control

I have used the default setting for the RAM specifications here. One can also set these settings on 'Auto'.


DIGI+ Power Control

CPU Load-line Calibration:

Counters Vdroop on CPUs, set it to Medium or High

CPU Current Capability:

Set it to 130%

VCCSA Load-line Calibration:

Set it to 'Regular'

VCCSA Current Capability:

Set it to 120%

VCCSA Boot Up Voltage:

Leave it 'Auto'

CPU Voltage Frequency:

Set it to 'Auto'

CPU Spread Spectrum:

Set it to 'Disabled'

CPU Power Duty Control:

Set it to 'T. Probe'

CPU Power Phase Control:

Set it to 'Optimized', good for overclocks from 4.6 to 4.8GHz

DRAM -AB and DRAM -CD Current Capability:

Set it to 120%

DRAM -AB and DRAM -CD Voltage Frequency:

Set it to 'Auto'

DRAM -AB and DRAM -CD Power Phase Control

Set it to 'Optimized'


CPU Performance Settings

Leave all settings on 'Auto'


Now back to Ai Tweaker:

CPU VCORE Voltage:

This differs from CPU to CPU. I honestly think for my i7 3820, 1.370V seems to work okay, but I

may feel safer with 1.380 ranges. I would not exceed 1.410 on overclocks between 4.6 to 4.8GHz

The ASUS rep also suggested to go for Offset of +0.200 if one wants to opt into power saving states

CPU VCCSA Voltage:

Manual Mode

CPU VCCSA Manual Voltage:

Set it to 1.100, do not go above this figure

DRAM Voltages:

Leave it at specified voltage ratings for your RAM

CPU PLL Voltage:

Set it to 'Auto'

VTTCPU Voltage:

More or less matches CPU VCCSA voltage, set it to 1.100


At the bottom of Ai Tweaker section:

CPU, PCIE Spread Spectrum:

Set it to 'Auto'. Other guides recommend leaving them 'Disabled' for better overclocking. I

guess for overclocks below 4.8, it may or may not help.


Go to Advanced Tab, then into CPU Configuration

Intel Adaptive Thermal Monitor:

Set it to 'Disabled'


Go into CPU Power Management Configuration

I left it all 'Auto'. If you use offset for CPU Voltage, then leave them enabled is going to help prolong the life of your CPU. Other guides recommend turning them off to prevent starving CPU of required power.


As a last step, go to the Monitor section

There is Anti Surge Support option at the bottom

Set it to 'Disabled'

I suggest you save the setting into a profile that can be done via the 'Tool' section.

Restart the computer with changes to take effect by pressing 'F10'.

With the settings above, I was able to boot into Windows without problem. I will have to run some benchmarks in order to gauge its stability, but I was surprised at how cold boot problem was gone. I suspect that it was primarily due to me conflating 'BCLK Frequency' and 'CPU Strap'.

Well, that's it for now! Good luck on your overclocking (although I'm sure that all of you will certainly have more experience in this), and most importantly have fun!


ASUS: How to Overclock an Intel X79 SandyBridge-E Motherboard