How to Manually Set and Undervolt your CPU Vcore

[tinytomlogan]

We show you how to manually undervolt your processor which will reduce temperatures and allow you to lower your fan speeds, leading to a quieter PC!


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[TheOuterOne]

Very helpful tutorial, thanks!

 

[WYP]

Very nice, good stuff to know. Nothing quite like lowering power consumption and temps.

I'll need to bear this in mind if i ever I need to build anyone a new rig.

 

[ShaunB-91]

Good article, reminds me I still need to find my correct stock, only been through the lower and test phase once.

 

[Lazlo]

Very helpfull. Always wanted to do this, but have never found the time to thoroughly inform myself on the topic.

TBH I thought it would be more complicated. Gonna' give it a go when I get home from work now that I know how to go about it.

 

[ramoine]

This is the reason I joined up on the forum .

I'm fairly new to overclocking and this guide will come in very handy , thanks !

 

[jamesriley94]

Just to add a little to this - been playing around with my own system last night/this morning.
Considering the most I do with my PC these days is browse the internet and watch films, there's never been much of a need to OC my 3960X or anything, and I've not really ever had the time since I got it.

Undervolted it this morning - 'Auto' volts set it to around 1.3v at stock clocks (3.9ghz turbo). After 30 mins of OCCT that managed to get the hottest core to 86 Degrees C.

After Undervolting, managed to get the volts down to 1.12v with the hottest core at 61 degrees.

Saving 25 degrees isn't half bad for something that's free and only takes a couple of hours.

 

[Bla]

This is great, the temps of my 4670k have dropped about 10 degrees C with the stock cooler. I haven't been able to stress test properly using OCCT since my temps gets too high within minutes, but it seems to be stable after some gaming sessions and AIDA64 stress tests. Do you guys think AIDA64's stress test is good/heavy enough for stability testing?

 

[Puck]

This is great, the temps of my 4670k have dropped about 10 degrees C with the stock cooler. I haven't been able to stress test properly using OCCT since my temps gets too high within minutes, but it seems to be stable after some gaming sessions and AIDA64 stress tests. Do you guys think AIDA64's stress test is good/heavy enough for stability testing?

AIDA64 been recommended to me by members of the OC3D community over OCCT because OCCT was producing odd results with the Haswell chips.

Here is a link to that thread:

http://forum.overclock3d.net/showthread.php?t=65692

 

[Bla]

AIDA64 been recommended to me by members of the OC3D community over OCCT because OCCT was producing odd results with the Haswell chips.

Here is a link to that thread:

http://forum.overclock3d.net/showthread.php?t=65692

Thanks! I'll keep using AIDA64 for stress testing then

 

[bacm8]

I'm facing a strange thing with my Maximus VI HERO and my 4670K, when I change the voltage in bios for example for 1.000V he just stay giving 1.087V, I tried to change between differents voltanges from that stock voltage to 1V and nothing change, in bios keep saying the voltage I entered, but in windows nothing change...
Any idea, I have the last bios version ..

 

[NeverBackDown]

I'm facing a strange thing with my Maximus VI HERO and my 4670K, when I change the voltage in bios for example for 1.000V he just stay giving 1.087V, I tried to change between differents voltanges from that stock voltage to 1V and nothing change, in bios keep saying the voltage I entered, but in windows nothing change...
Any idea, I have the last bios version ..

That's probably normal. LLC could just be raising it slightly.

My 3570k for example is set at 1v at 3.6ghz 24/7 in the bios and when i'm not gaming or benchmarking it stays anywhere from .972-.992. I'm never at 1v unless i'm stressing the cpu.

 

[bacm8]

That's probably normal. LLC could just be raising it slightly.

My 3570k for example is set at 1v at 3.6ghz 24/7 in the bios and when i'm not gaming or benchmarking it stays anywhere from .972-.992. I'm never at 1v unless i'm stressing the cpu.

Ah ok thanks for the tip!

 

[Master&Puppet]

That's probably normal. LLC could just be raising it slightly.

My 3570k for example is set at 1v at 3.6ghz 24/7 in the bios and when i'm not gaming or benchmarking it stays anywhere from .972-.992. I'm never at 1v unless i'm stressing the cpu.

Not quite right, LLC has no effect on the CPU vCore since Haswell because the iVR manages the power draw from within the CPU. But anyway, the figure typed into the motherboard is only a reference and the actual power supplied will be slightly different depending on the motherboard manufacturer's power reference table.

 

[NeverBackDown]

Not quite right, LLC has no effect on the CPU vCore since Haswell because the iVR manages the power draw from within the CPU. But anyway, the figure typed into the motherboard is only a reference and the actual power supplied will be slightly different depending on the motherboard manufacturer's power reference table.

Well that changes things.. Didn't know that. I never had a chance to mess around with a haswell rig before. Though didn't Devils Canyon take that off die? Can't remember exactly..

 

[ShaunB-91]

Glad this article was in the recent threads, needed it again. Had to restore my BIOS and can't remember how to undervolt the CPU off the top of my head.

 

[Master&Puppet]

Well that changes things.. Didn't know that. I never had a chance to mess around with a haswell rig before. Though didn't Devils Canyon take that off die? Can't remember exactly..

DC is basically Haswell. A few changes to the manufacturing process on the CPU and a few nice additions to the chipset but fundamentally Haswell and DC are the same. Both have iVRs.

The confusing comes with you having an ivy bridge rig and with Haswell + DC still having legacy controls. With ivy, I, like you basically used vCore and LLC to set the CPU.

Haswell is more complicated. LLC only applies to the motherboard, not vCore. VCore applies directly to the die but also the vRing voltage and cache frequency has been separated from the core (as it was with ivy) so that adds an extra step.

 

[NeverBackDown]

DC is basically Haswell. A few changes to the manufacturing process on the CPU and a few nice additions to the chipset but fundamentally Haswell and DC are the same. Both have iVRs.

The confusing comes with you having an ivy bridge rig and with Haswell + DC still having legacy controls. With ivy, I, like you basically used vCore and LLC to set the CPU.

Haswell is more complicated. LLC only applies to the motherboard, not vCore. VCore applies directly to the die but also the vRing voltage and cache frequency has been separated from the core (as it was with ivy) so that adds an extra step.

I know they are the same, i thought DC just moved the VR back onto the board. Makes more sense now

 

[madness777]

I've got my E8400 undervolted to 0.95v, completely rock solid!
Readout:

 

[Moonchild]

Can I do this on my laptop, or is it limited on desktop mobos ? I suppose lower voltage will lead in lower power consumtion, resulting in better battery life