P8Z68-V LX Voltage Offset Woes

misterPaul

misterPaul

misterPaul

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2 Aug 2011
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Hi I've got a P8Z68-V LX with a 2500k that I'm currently overclocking to 4.6Ghz using a 46x multiplier. I'm having some trouble getting the voltage to the setting I want. I don't have the choice of disabling "offset mode", and the voltage which I'm offsetting from doesn't seem to be constant. This is the screen I have:

http://images.anandtech.com/galleries/1229/ASUS BIOS 3 - AI Tweaker_575px.png

If I set the Offset CPU voltage to +0.005v, the vcore in cpu-z reports 1.35v. If I set it to -0.005v, it offsets from a much lower value which in bios says is 1.26v, and I can't boot.

It doesn't matter if Load Line Calibration is on or off, the voltage still seems to offset from different values to what it says. I've disabled all the automatic systems I can find that mess about with voltage, and can't figure out why the value I'm offsetting from won't stay constant. Sometimes bios reports the base voltage as 1.165v, sometimes 1.3v, and a few times it has said 1.26v.

Also, with load line calibration turned on i'm seeing massive increases in voltage - heavy loads makes the processor jump from 1.34v to 1.4v+ and I don't really want to exceed 1.36v or so. If I turn off LLC I end up with voltage dropping to 1.26v and the thing crashes.

Is there any advice anyone has for getting a decent overclock from this mobo? All I want to do is figure out the highest overclock I can get at about 1.33v, with LLC on, which shouldn't peak past 1.37v under full load. This offset jazz is driving me crazy! Why can't I just select 1.33v?!
 
I don't have that exact board but try this, choose offset mode and set as high a negative offset as you can which still allows windows to boot up. Then go into the cpu settings of the bios and increase the additional turbo voltage setting a bit at a time. This has worked with my Asus P8Z68-V Pro
 
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I am having this exact problem, I am regretting buying this board now as it has the offset voltage mode but you cannot actually set a voltage for the cpu, any help most welcome.
 
You might struggle to get much higher than 4.6ghz at a decent vcore due to not having all the bios options available.

I have this board and I am 4.5ghz stable. I can't remember my exact settings and I'm at work but I didn't change that much.

I first selected the XMP profile for the RAM and then manually changed the voltage to 1.5V. For you, I would set it to the XMP profile and not change the voltage first off to ensure you're isolating any blue screen to the CPU only.

Change the multiplier to x44 first with LLC enabled (not auto) and is it, PLL overvoltage(?) enabled as well. Then offset the voltage by +0.005 and boot in. See what happens and run prime or IBT for 30 minutes to see if it's OK. You'll need to test for stability for a longer period later on but 30 minutes is fine for now.

The huge spike in vcore while the CPU is under a smallish amount of load is due to vdroop I believe. Enabling LLC should counter-act this.

Do you have C1E, speedstep, etc enabled? You should do if you don't.
 
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