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Help with offset concerns?

post #1 of 4
Thread Starter 
I'm currently learning about overclocking, starting small at 4.0 Ghz just to figure out how things work.

At 1.160 vcore, 1.7 PLL and 40 multiplier I can pass half an hour of prime custom blend with 5500 MB of memory used, any lower with the vcore and it quickly throws a rounding error.

Now I'm trying to figure out offset mode because I would like my vcore to lower when the CPU is not under load.

I reset to stock settings (multi and everything, except RAM voltage and PLL, didn't like the values on either) on my ASUS P8Z68-V Pro to look at the difference between VID and vcore.
Stock for this board is a positive auto offset, but when I look at my vcore (1.28v) it is lower than my VID (1.3411) under load.


My question is that I thought a positive offset was supposed to add to the VID voltage, not subtract from it, which is what it appears to be doing?

According to what I've read on these forums, you take VID under load (1.3511 @ 4.0) and figure out the difference between that and your stable manual vcore (1.160 before final tweaking). I did this and believe my starting value for offset should be around -0.295, however, when I enter this into BIOS it colours it red, usually meaning it is pushing the limits of something.

From the combination of these two things I'm a little hesitant to try the offset at that value because from what I can tell everything seems to be doing the opposite of what I expected and I don't want it adding 0.295v (or any amount really) to my VID of 1.3511 giving me a vcore of 1.6 or more doh.gif

If I'm not understanding this correctly at all I'd really appreciate an explanation lol. I think I have it right but the way the board is handling auto offset is confusing the hell out of me.



TL;DR - Two questions. One, does auto offset choose whether it adds or subtracts from VID, or is it fixed to one or the other?
Two, I want to confirm that if I set offset to - it will subtract from my VID, correct?

Thanks for the help guys this forum has been awesome so far and I love finally having a PC that can play games thumb.gif
post #2 of 4
I'm not familair with how ASUS boards handle VID offsets, but I would suggest configuring voltages manually, then testing small levels of offset with predictable loads (prime95, for example) to understand how exactly things are working.

In all honesty, lower idle voltage is almost completely meaningless. You aren't going to be extending the life of the CPU appreciably or significantly reduce idle power consumption because there is virtually no current draw at idle anyway, and current is a big part of the equation of both.
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post #3 of 4
@ Blameless

Hi

I am a noob to O/C'ing too and have just about finished a O/C on my i5 2500k. I have a stable (8hrs in Prime95 blended) 4.8Ghz with a manual Vcore of 1.35v and llc @ 75%. I have no stepping working on my rig atm too and at 1.6Ghz idle the Vcore is around 1.36v. under full load its 1.352v @4.8Ghz. If having the vcore this high at Idle is not an issue I wont worry! I do understand what you said about current, makes sense smile.gif
post #4 of 4
Thread Starter 
Thanks Blameless, I think I figured it out. +rep

The board seems to be picking a value to offset from based on what the multiplier is set to. The value it picks is not the same as what my VID shows up as in Real Temp and Core Temp though.
I think the value it picks to offset from is just what it sets the voltage to when in "Auto" mode but I have to test that a bit more to say for sure.
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