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Does PLL affects OCing?

post #1 of 20
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Hi all, can I ask what does exactly PLL do, and does it affect the performance of a unlocked processor? What are the benefits of PLL? Thanks. thumb.gif
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post #2 of 20
Phased-Locked-Loop, it is kind of like a clock used to set various bus speeds within the CPU. Sometimes, rarely, bumping up the voltage for it can help with OCing. Mostly leave it set at AUTO. Check the Intel site for its voltage ranges: http://ark.intel.com/
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post #3 of 20
The i7 900 series actually liked it bumped down for stability
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post #4 of 20
Agreed leave it to Auto. I have gone up to 5.2-.5.4 without touching the pll voltage and ive also noticed on some of these z77 boards the options to change pll is basically non existant instead your given a Auto or +10 options which i do not recommend. If your at an oc thats on the brink of stablity than giving it iether A. more vcore or B.more vtt,vcssa voltage.
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post #5 of 20
Thread Starter 
Quote:
Originally Posted by OS-Wiz View Post

Phased-Locked-Loop, it is kind of like a clock used to set various bus speeds within the CPU. Sometimes, rarely, bumping up the voltage for it can help with OCing. Mostly leave it set at AUTO. Check the Intel site for its voltage ranges: http://ark.intel.com/
When is "sometimes" it does help?

Quote:
Originally Posted by Clexzor View Post

Agreed leave it to Auto. I have gone up to 5.2-.5.4 without touching the pll voltage and ive also noticed on some of these z77 boards the options to change pll is basically non existant instead your given a Auto or +10 options which i do not recommend. If your at an oc thats on the brink of stablity than giving it iether A. more vcore or B.more vtt,vcssa voltage.
so its better to leave it auto or bump it down and push the vcore up?
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post #6 of 20
So far I'm finding lowering it is having no effect at 4.6GHz, I've dropped it all the way down to 1.4v and had no problems. I ran P95 with AVX Custom Blend 5000MB for 30 minutes and no crash. I'll be doing a 12hour run tonight at 1.6v CPU PLL see if it survives.

I did try 1.3v CPU PLL but it wouldn't POST.
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post #7 of 20
Quote:
Originally Posted by cr4p View Post

When is "sometimes" it does help?
so its better to leave it auto or bump it down and push the vcore up?
Sometimes, if you're unlucky, you get a mobo with weak VRMs and bumping up the PLL voltage helps compensate for it. In my personal experience, i7 920, 930, 960, 875, and 3930K, I've never had a case where bumping PPL voltage down or up helped with OCing (all on ASUS mobos). AUTO has always worked.
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post #8 of 20
Thread Starter 
Quote:
Originally Posted by Matt26LFC View Post

So far I'm finding lowering it is having no effect at 4.6GHz, I've dropped it all the way down to 1.4v and had no problems. I ran P95 with AVX Custom Blend 5000MB for 30 minutes and no crash. I'll be doing a 12hour run tonight at 1.6v CPU PLL see if it survives.

I did try 1.3v CPU PLL but it wouldn't POST.
Please let me know the results. biggrin.gif
Quote:
Originally Posted by OS-Wiz View Post

Sometimes, if you're unlucky, you get a mobo with weak VRMs and bumping up the PLL voltage helps compensate for it. In my personal experience, i7 920, 930, 960, 875, and 3930K, I've never had a case where bumping PPL voltage down or up helped with OCing (all on ASUS mobos). AUTO has always worked.
Thanks! I was wondering before if it functions the same or side-by-side with the vcore. biggrin.gif
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post #9 of 20
Recently oc'd a new 3770k, at 4.7 I could not boot into windows untill I dropped my pll from 1.8x to 1.65, got a bsod on windows loading screen no matter what vcore I ran until lowering pll. Might be my board(asrock z68 extreme 3 gen 3) but either way it helped me out quite a bit.
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post #10 of 20
Thread Starter 
Quote:
Originally Posted by tjb433 View Post

Recently oc'd a new 3770k, at 4.7 I could not boot into windows untill I dropped my pll from 1.8x to 1.65, got a bsod on windows loading screen no matter what vcore I ran until lowering pll. Might be my board(asrock z68 extreme 3 gen 3) but either way it helped me out quite a bit.
so lowering the PLL helps to stabilize the system during overclock...
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