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How do I use Offset Voltage?

post #1 of 10
Thread Starter 
Today I had heard about setting the CPU voltage to offset, how would I go about doing this?
I have mine manually set to 1.415v (stays around 1.42v anyways) but since I have Speed Step on i'd like the voltage to vary based on the GHz the CPU is at if that's what the offset is supposed to do? (Not entirely sure).

I apologize if this isn't the right place to ask this, but it would be greatly appreciated if someone could shed some light on this for me. I'm very new to PC building and overclocking, so again I apologize if this is a foolish question.
post #2 of 10
It's in the BIOS. Instead of using a manual voltage, you'd change it to offset and put in a value there. Do a lot of reading on the subject first. I did a couple days reading and playing with it to figure it out.

Basically, download Core Temp and run it while on full load and see what your VID is, take your manual that you're at now, subtract your VID, and that will be your offset value. LLC also plays a part. LLC is Line Load Calibration. It basically helps control VDroop. The higher the LLC, the less VDroop there is. When using offset, keep in mind that whatever value you set affects the VCore load AND idle value. So don't go too low or the idle VCore will drop causing it to be unstable. This is basically what I understand, I'm sure someone more experienced could add some more to it.
post #3 of 10
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post #4 of 10
Thread Starter 
In the BIOS it's just stuck in Manual mode, I cant change it to anything else. Any idea why this is happening? Is there something else that needs to be enabled for me to be able to change it to Offset?
post #5 of 10
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post #6 of 10
I'm new to all this offset stuff too. First I worked out what voltage I needed to be stable at my chosen OC by using a manual vcore (in my case 1.12v for 4.2ghz). I then went into the BIOS and changed the vcore option from manual to offset and left the offset value at auto and booted into Windows. I kicked off Prime95 and noted the vcore (way more than necessary). Rebooted into the BIOS again and changed the offset voltage from auto to a minus value. Took a few attempts before finally getting the offset value correct so that when Prime95 starts the vcore sits at 1.12v (LLC on Ultra High, EIST enabled, C1E, C3 & C6 on Auto). Not sure if this is the right way to do it but it worked for me lol. CPU runs down to 1600mhz 0.9v when idle and ramps all the way up to 4200mhz 1.12v and everywhere inbetween as needed.
Edited by iSeries - 5/10/12 at 8:40pm
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post #7 of 10
Thread Starter 
Okay I figured out why I wasn't able to set the CPU voltage to Offset, I had to change Phase Control from Extreme to something else. Any suggestions on what this should be set to (Standard, Optimized, Manual)?

Here are my specs:

i7 2600K @ 4.8GHz (Set manually to 1.415v)
ASUS Maximus IV Extreme P67
Mushkin Enhanced Redline 16GB @ 1600MHz
EVGA GTX 570
H100 CPU Cooler (push/pull config)
Corsair AX1200 PSU
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post #8 of 10
Quote:
Originally Posted by Moridin View Post

Okay I figured out why I wasn't able to set the CPU voltage to Offset, I had to change Phase Control from Extreme to something else. Any suggestions on what this should be set to (Standard, Optimized, Manual)?
Here are my specs:
i7 2600K @ 4.8GHz (Set manually to 1.415v)
ASUS Maximus IV Extreme P67
Mushkin Enhanced Redline 16GB @ 1600MHz
EVGA GTX 570
H100 CPU Cooler (push/pull config)
Corsair AX1200 PSU
Corsair Obsidian 800D

What LLC option are you using? I believe that when using offset you should use the LLC with the least vdroop / vboost, so for us Asus users that would be Ultra High. As for phase control, I left that on auto. Figured as I dont really know which option to choose, better to leave it to the mobo. One could rationally guess that Optimized would be the one to go for, but I honestly don't know smile.gif
Edited by iSeries - 5/10/12 at 9:01pm
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post #9 of 10
Thread Starter 
Quote:
Originally Posted by iSeries View Post

What LLC option are you using? I believe that when using offset you should use the LLC with the least vdroop / vboost, so for us Asus users that would be Ultra High. As for phase control, I left that on auto. Figured as I dont really know which option to choose, better to leave it to the mobo. One could rationally guess that Optimized would be the one to go for, but I honestly don't know smile.gif

I'm using Ultra (75%) as my LLC. I'm guessing Optimized for phase control as well, but I just want to make sure i'm going with the right choice for sure so needed a second opinion on it.

EDIT: So pretty much to start off the Offset overclocking I set cpu voltage to auto when I boot up Windows to figure out the average voltages i'd need?
post #10 of 10
If you do auto the board will always over volt for what you need. But, do auto so you can find your VID in Core Temp. Take VID and you know that's highest you'll need for that particular clock. Then you can start setting offsets to get to where you know it's stable under manual VCore.
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