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Lowest voltage for overclocking i7 920 to 3.2Ghz

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August 15, 2009 6:10:04 AM

I am wondering what is the lowest possible voltages, including vcore, QPI, and etc, such that you can overclock the i7 920 to a stable 3.2Ghz.

Any help will be appreciated, thanks a lot.

Currently, I have the following setting in my Asus P6T bios:

AI Overclocker Tuner: [Manual]
CPU Ratio: [Auto]
Speed-step: [Enabled]
BLCK Frequency: [160]
PCIE Frequency: [100]
DRAM Frequency: [DDR3-1604 MHz]
UCLK Frequency: [Auto]
QPI Link Data Rate: [lowest one]

DRAM Settings:
8-8-8-24

Voltages:
Vcore [1.15]--I may be able to go lower, but unstable at 1.00 for sure.
CPU PLL Voltage: [Auto]
QPI/DRAM Core Voltage: [Auto] -- Is there anyway that I can check how much this indeed is?
DRAM Bus: [1.64]
Rest on auto
August 15, 2009 6:14:45 AM

oops, just got this result from Intel Burn Test, the maximum level stress: failed.

So I guess I need to increase vcore voltage right?

Help please, thanks :) 
a b à CPUs
a b K Overclocking
August 15, 2009 6:02:05 PM

Every single chip is different. So there isn't a specific voltage you can use for every chip for a given OC. I don't know what the general range is for the core i7. but typically in you situation you may need to either up the voltage or turn down the clocks.
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August 16, 2009 12:59:32 AM

Agreed that every chip is different, but if this helps I had my Voltage set at 1.18V for 3.2Ghz on a 920 D0 stepping. Same Bclk, and most other settings; although I had the Ram tuned low at that point. The mobo I have is a MSI X58 Pro though....
August 16, 2009 3:58:20 AM

I got it stable at 1.175 vcore for 3.2Ghz on my D0 920.
Ram is running 1600 with QPI voltage 1.3.

But I figure the faster ram doesn't really help in performance, so I slowed it down to 1066 default speed, and lower the QPI and Dram Bus voltage to [Auto], but has a slightly tighter timing. This way, the temperature is lower by about 2C.
:0
August 16, 2009 7:25:54 AM

You must be a freaking nut thinking that the core i7 is going to be using enough of it's power to over heat so why not just use the maximum rated voltage.
August 16, 2009 5:23:41 PM

I have a p6t V2, and I use the Auto settings, with the same BCLK, 160. Put your QPI at maximum to improve memory bandwidth. Hope all this was useful.

It's a shame that the chips are always different, because helping with advanced overclock gets hard. If you have any problem, remember to put avery possible setting on AUTO and then change them in order to get a more stable OC.

You're welcome.
January 29, 2011 8:50:55 AM

I have my Core i7 920 @ 3.2GHz with the cpu voltage at 1.1v cpu-z says its using 1.088 and i have turbo mode on.
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