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Old 02-13-11, 09:56 AM   #9
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Join Date: Jan 2006
Posts: 6,726
Default Re: What voltage to use?

Originally Posted by HiCZoK4 View Post
what is vdroop?

You mean how vcore is chaning when under Load? Yes I did. Ive set it to bios to 1,35v with 2,8 and it goes 1,34-1,37 at max
Here is the technical understanding of it.

I've heard a variety of things about why it's there. Here is another nice litle discussion from XS.

I can't remember if it was Vdrop or Vdroop, but I've also heard discussion of needing to have the voltage lower under load so that when the CPU comes back out of load it doesn't overshoot the idle voltage. It looks like they are also talking about vdroop for that as well.

After reading some of the comments in the 2nd link it sounds like in link #3 the issue is mainly caused by cheap components with low regulation. Guessing the issues present in the 3rd entry can be migitaged by having a high end PSU and motherboard. A good scenario I can think of it a cheap PSU that starts out at like 12.5V on the 12V rail and under load falls to 11.7V. Once that is unloaded again there will be a huge increase in voltage. Combine that with some cheap motherboard regulation and it could send the CPU voltage well above what it's set at until it settles back to the correct voltage. By using more vdroop you can cheat and lower the voltage enough so that when this happens it won't cause the current to go above the motherboard settings.
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