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Is undervolting CPU PLL voltage safe? & Is it safe to use internal pll overvolt?

post #1 of 13
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I am just messing around with my overclock lately and decided to lower my PLL voltage because I had read of other users experiencing better temps. Is it ok to undervolt the PLL.

Also would I be able to still have internal PLL overvoltage enabled or does that defeat the purpose? Does internal pll overvoltage increase the actual pll voltage?

Is it safe to use internal pll overvoltage.


Also what exactly does internal cpu pll overvoltage do?
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post #2 of 13
Ive heard its,

CPU PLL Overvoltage allows for less clipping of that voltage. It can also reduce the lifespan of the CPU, but nothing noticeable
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post #3 of 13
Quote:
Originally Posted by VonDutch View Post

Ive heard its,
CPU PLL Overvoltage allows for less clipping of that voltage. It can also reduce the lifespan of the CPU, but nothing noticeable

HEY!!! where did you hear that >.> ph34r-smiley.gif

Think of the CPU PLL voltage as a voltage that is provided to the CPU, but then “clipped” down to an approximate voltage. No matter what that input is whether 1.3v or 1.9v it is clipped (hypothetically let’s say 800mv after clipping that way other devices can use the PLL voltage and clip to what they need. The CPU PLL Overvoltage allows for less clipping of that voltage. It can also reduce the lifespan of the CPU, but nothing noticeable.
    
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post #4 of 13
Quote:
Originally Posted by Hokies83 View Post

HEY!!! where did you hear that >.> ph34r-smiley.gif

just messing with ya, the +rep is yours wink.gif
that is, when the thread starter likes youre answer.. lol
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post #5 of 13
Yes, it is safe to undervolt the PLL voltage as long as it doesn't impact stability, and it does reduce CPU temps (I think it was about 3C for mine). Internal PLL Overvoltage is a different thing, so you can reduce PLL voltage and have Internal PLL Overvoltage enabled at the same time, but I wouldn't enable it unless you need to. It is really only needed once you hit the Vcore wall (usually above 4.5), where it allows an extra multiplier or two - it normally doesn't have much benefit at lower overlocks.
post #6 of 13
I am running 3770K up to 4.9GHz with only 1.50V on PLL voltage, no stability problems. at 5GHz daily I have to bump it up to 1.55V ... that is like it is with Ivy Bridge chips, for Sandy Bridge however you won't be able to lower the PLL much from BIOS defaults if at all (stability goes bonkers) ...

Running lower PLL may help lower the under load temps on CPU (don't expect miracles though).

as far as I know there is never a problem with running less volts if it doesn't affect stability. it's always the overvolting which shortens the lifespan of electrical components.

also, something I myself learned recently.
the Internal PLL Overvoltage (enabled/disabled) has not much in common with CPU PLL voltage (except for name) specified in BIOS. those are 2 different things, however they are related to some extent.
Edited by feniks - 11/2/12 at 12:19pm
post #7 of 13
@feniks

There are people that notice better stability with a lower PPL, ranging from 1.6 to 1.8v some even a bit better with higher,
Just test some settings out, it seems every cpu reacts different to changing ppl voltage
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post #8 of 13
in some cases undervolting the pll helps like my cpu likes 1.65 i can run better overclocks with it at 1.65 compared to the stock 1.7. I never could get 5ghz or 4.8ghz stable til i droped my pll to 1.65 now both clocks are 100% stable and i am even able to run 5300mhz for benchmarking befor it wouldnt even get in windows.
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post #9 of 13
Quote:
Originally Posted by prescotter View Post

@feniks
There are people that notice better stability with a lower PPL, ranging from 1.6 to 1.8v some even a bit better with higher,
Just test some settings out, it seems every cpu reacts different to changing ppl voltage

LOL, I tested it out long time ago fellas and for Ivy Bridge it works with lowest settings unlike with Sandy Bridge chips like you guys have wink.gif

of course I can run default 1.80V PLL, but what for if the chip is same stable with 1.50-1.55V? I don't like overvolting stuff when I don't need to wink.gif
as I said, I run 5.0GHz daily 24/7 on my 3770K and it runs great with 1.55V on PLL biggrin.gif

here, more and more people reporting the same things on Ivy Bridge chips:
http://www.overclock.net/t/1305797/droping-pll-voltage-on-3770k
Edited by feniks - 11/2/12 at 6:24pm
post #10 of 13
idk..but I've noticed in the newer Asus BIOSes you can't limit the amount of pll overvoltage..I don't like that.I used to set to .012-.020 (after enabling) and work from there.
 
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