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i7 920 vcore fluctuations

G

GeminiDragon

n00b
Joined
Nov 3, 2008
Messages
18
I was running with the voltage in the bios set to auto, but my cpu was running hot at load, >70C. I'm using a Zalman 9900. The auto voltage in the bios was 1.29v!! So I decreased the voltage to 1.15 and started occt to test for stability, but as it was running I noticed the vcore was jumping up and down constantly. I set the voltage to back to auto to have a comparison, and the vcore didn't fluctuate aside from the change from idle voltage to load voltage. My PSU is a PC Power and Cooling 750watt, about two and a half years old. LLC is disabled, and I reverted back to 1.15 under the assumption this is all normal.

I am just curious if these fluctuations are normal or will they damage the cpu? The variation seems to be one hundredth of a volt, flickering between 1.1 and 1.09. CPU-Z and everest show the same voltage variation.

2010-07-19-16h44-VCore.png
 
It's normal to see small fluctuations like that coming from software. Nothing to worry about.
 
I'm quite certain the intel voltage reported to software is limited to a granularity of 16mA. If the voltage reported sits on the edge you will see it fluctuate between 2 values.
 
I think you mean limited to a resolution of 16mV. Though I'm pretty certain that is not true.
 
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