Need some help dropping voltage on a 3930K

Catanonia

Catanonia

Catanonia

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Hi,

As you might know I have a stable 4.8 OC on a 3930K with everything set to auto in the bios other than 1.476V VCore.

It works fine, but of course the VCore according to CPU/Z is at 1.4x volts constantly and I want to reduce this when the CPU is idle.

I have enabled all the CE(x) state power settings and CPU/Z shows that the CPU does indeed throttle to 1200Mhz as expected BUT the VCore stays high.

Now this is because I have set it in the BIOS and it overrides, I understand.

I have been reading this link

http://www.overclock.net/t/1189242/sandy-bridge-e-overclocking-guide-walk-through-explanations-and-support-for-all-x79-overclockers

and it talks about using DVID. In my bios this is grey out to auto 0V and I can't change it. There are VTT, PLL and IMC voltages I can change, but I don't want to mess if I don't know what I am doing as reports are you can kill chips with high values.

But for the life of me I can't work out how to do this and am scared I may add in wrong values.

My board is a GB X79-UP4 with latest F2 bios on it.

Can someone give me a simple guide on how to get the voltage to drop with a fixed VCore in the bios please on a X79 GB board?

Really struggling and searched everywhere for an explanation and failed.

Thank you
 
I have worked it out, the UEFI BIOS for Gigabyte really needs sorting out as impossible to work out the options for some settings as not listed or in the manual.

Worked out for VCore there is a setting called normal. If you type this in then it enables DVID and you can put in the offset to take the voltage higher when it needs to go higher.

I set the LoadLineCalibration LLC to 80% high.

My VCore before was 1.475 for a stable 4.8Ghz and it stuck there even when the CPU throttled back 24/7

Now I have VCore to normal and DVID to 0.140 and the PC is behaving as I would expect. VCORE = LLC + DVID + SVID

It now idles at the 0.9v and under 4.8Ghz is around 1.38volts.

Now need to stress test and maybe raise or lower the DVID.

End result is instead of running at 1.46volts 24/7, mainly I am at 1v or under 80% of the time until I push the PC with processing. :D

Happy days.
 
Last edited:
Noticed now that core 5 is about 8 degrees hotter on idle than all the others. A bit over the top and may re-seat the water block to see if there were some paste bubbles.

Looking good though.
 
Sweet, looking good now. Just done a 20min Prime run and max temp was 75 ambient 20 @4.8Ghz

The voltage held at 1.38v compared to 1.46 before, so a drop of 0.08v and it seems much more stable now. Also throttle backs nicely to 0.9v on idle :)

Happy bunny ;)

My advice for anyone using a GigaByte board is to use normal mode for the VCore and set a DVID and LLC to clock and not use a static voltage.
 
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