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VCCIO and Internal PLL Overvoltage

post #1 of 14
Thread Starter 
What do these do precisely? I read something that suggested PLL Overvoltage if enabled allows higher voltages to be delivered to the core, as if it is some sort of limiter on the max voltage (i.e., regardless of your BIOS Vcore settings). Is that true, slightly off or completely off?

Is it some sort of protection mechanism around 1.38v because 1.38v is what the max recommended/safe/whatever voltage is?

With both of these adjusted -- PLL Overvoltage enabled and VTT I raised to 1.1v -- I am having a lot better results. I'm just trying to understand what these do, particularly the VTT voltage, so if I find instability I know which to change. Obviously I'm kind of on the right path now... previously without these settings I couldn't boot regardless of my Vcore.
    
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post #2 of 14
EDIT : Nothing
Edited by 0razor1 - 7/28/11 at 4:17pm
post #3 of 14
PLL lets you reach very high multipliers when overclock (like 48+)

if you couldnt boot with 45x, but can with pll, then i guess you just need it a little bit sooner than most

that vtt shouldnt make a difference
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post #4 of 14
Thread Starter 
Well I could boot at 45, I was stable at 45 with 1.29v.

I have read from another senior member here that increasing VTT/VCCIO (they are the same thing right?) can help in certain situations, particularly with STOP 0x9C, which I did get a day or so ago.

Quote:
Originally Posted by 0razor1 View Post
AFAIK ,
PLL is to the crystal frequency generator..
Higher volts *SHOULD* enable higher clocks where the PLL chip is failing @ higher OC's

I have Vmem and Vaux , besides Vcore..
Well , the Vmem is for the ram , the Vcore is for the GPU chip , and the Vaux is for the PLL ..
thats all I know
PLL Overvoltage, not PLL voltage. I want to know what the overvoltage function does.
    
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post #5 of 14
EDIT : Nothing :@
Edited by 0razor1 - 7/28/11 at 4:17pm
post #6 of 14
Quote:
Originally Posted by donkrx View Post
Well I could boot at 45, I was stable at 45 with 1.29v.

I have read from another senior member here that increasing VTT/VCCIO (they are the same thing right?) can help in certain situations, particularly with STOP 0x9C, which I did get a day or so ago.



PLL Overvoltage, not PLL voltage. I want to know what the overvoltage function does.

read my post, pll overvoltage on the cpu does just what i said - makes it stable on very high multi's. if you're getting random bsod's and you happen to encounter one that points to something different - its not a sure sign that some random voltage is wrong. bsod's point you in the general direction, they dont pin down what needs to be done... how can windows be COMPLETELY sure what went wrong?

@0razor1 just edit it to nothing
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post #7 of 14
I was having data corruption until I raised my VTT up to about 1.1v. It passes stress tests just fine though.
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post #8 of 14
Ew what? What kind of corruption?
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post #9 of 14
Data corruption, I booted up my pc one day to be greeted to chkdisk and a couple logs in event viewer. Bumped up the VTT to 1.1v and haven't had a problem since.
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post #10 of 14
Thread Starter 
Quote:
Originally Posted by Roksonixx View Post
read my post, pll overvoltage on the cpu does just what i said - makes it stable on very high multi's. if you're getting random bsod's and you happen to encounter one that points to something different - its not a sure sign that some random voltage is wrong. bsod's point you in the general direction, they dont pin down what needs to be done... how can windows be COMPLETELY sure what went wrong?

@0razor1 just edit it to nothing
What I meant in my first post - and sorry that this wasn't clear - was what is it's physical purpose and use... not just how it relates to overclocking SBs (because I already know that much). For one example, what does it do at lower clock speeds and why is it set to disabled in that case?

I want to have a decent understanding of it's intended functionality to make better guesses when overclocking (especially as I get closer to the multi wall). As you said, BSODs just point you in a general direction, and the same is true for advice on this forum. Not everything is true for everyone so the more I know, the better I can troubleshoot my OC.
    
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