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Idle voltage higher than it should be

post #1 of 3
Thread Starter 
When I first put my system together my system would underclock itself to 1.6Ghz when idle and drop the voltage to 1v or less. Now that I've overclocked my system my frequency still drops to 1.6Ghz when idle but my voltage barely drops.

Idle:
1600 Mhz
1.272v - 1.28v
29C temps

Load:
4.5 Ghz
1.288v -1.296v
55C temps

As you can see, the voltage is barely dropping when it goes from 4.5Ghz to 1.6Ghz. I realize that 1.28v isn't a big deal but I'm curious as why this is happening. Thanks in advance

System:
P8Z68 V pro motherboard - EPU turned off - Speedstep enabled
2500k @ 4.5Ghz
8GB PC3-15000 ram
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post #2 of 3
Welcome to OCN

Whats the vcore in the bios for your overclock?

EDIT: The reason as to why it's not dropping the voltage is may be because you are using maual voltage as aposed to offset, try using offset voltage and then it should undervolt when it's idle
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post #3 of 3
Thread Starter 
Thanks for the welcome! My vcore is set to 1.290v in the bios.

You're absolutely right, I have it set to manual voltage in the bios. How exactly does offset work? I tried changing it to offset and entering the difference between what I wanted and what it showed but instead of providing 1.290V it instead provided 1.42v. I have my current config below

EDIT: When I set it to offset it shows 1.0xxV in the bios but even a small offset such as 0.05v causes Windows to report over 1.4v when prime95 is running. Can't seem to get the hang of it. Do I have to disable the C states?

EDIT2: I disabled the C states and set it to offset. I was able to get the idle voltage down to 0.96xv but the load voltage was still high (1.32v). -0.060 seems to be the lowest value I can select. Anything lower and the text turns red which makes me nervous.

EDIT3: Dropping the load-line calibration from extreme to ultra-high fixed the problem.

Edited by nezzarix - 7/22/11 at 5:59pm
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