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Does PLL affects OCing? - Page 2

post #11 of 20
Quote:
Originally Posted by cr4p View Post

so lowering the PLL helps to stabilize the system during overclock...

its more like, it can help stabilize a oc, or it could help you to get the temps down a little,
but its not written in stone so to speak smile.gif
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post #12 of 20
Quote:
Originally Posted by VonDutch View Post

its more like, it can help stabilize a oc, or it could help you to get the temps down a little,
but its not written in stone so to speak smile.gif

This^

I read a lot that it makes no difference for people, but I also read some people lowing it to stabalize higher oc's, and it turns out it helped me out quite a bit, as always YMMV.
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post #13 of 20
Sorry double post
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post #14 of 20
My machine is completely unstable anything past 4.6+ without pll overvoltage and putting it at ~1.832
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post #15 of 20
To clarify: pll overvoltage and the specified CPU pll voltage are 2 different things, most people have to enable pll overvoltage in order to get an oc of ~4.7 and higher, however the CPU pll specified voltage is the variable item, some change it, some don't.
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post #16 of 20
Thread Starter 
Quote:
Originally Posted by tjb433 View Post

To clarify: pll overvoltage and the specified CPU pll voltage are 2 different things, most people have to enable pll overvoltage in order to get an oc of ~4.7 and higher, however the CPU pll specified voltage is the variable item, some change it, some don't.

So what does PLL Overvoltage really does? What happens if I enable it?
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post #17 of 20
I run my PPL voltage at 1.58 and my system has passed 12 hours of prime. I just always tend to use the lowest amounts of voltage, lol. Even tho temp difference was only about 2c.
post #18 of 20
Quote:
Originally Posted by cr4p View Post

So what does PLL Overvoltage really does? What happens if I enable it?

Well I'm no expert, but from what I've read:

When the Vcore is sent into the chip, it is clipped down to a smaller voltage to be used by different parts of the inner magic of the chip (and maybe elsewhere?). Enabling PLL Overvoltage allows less clipping of of that voltage, sending extra juice down the line to the extra bits of magic, this allows those bits to "keep up" with the processor itself, allowing for higher clock speeds. It is believed around here that when you hit the multiplier wall with it off, turning it on can allow you another 4-5 multipliers. It was also stated by an Intel engineer that it will lessen the life of the chip, but "Nothing noticeable", as he said.

So basically, if you aren't going for a crazy overclock, and don't need it on, don't use it, if you hit the multiplier wall and need to turn it on to be stable, by all means use it, with the understanding that it may lessen the life of your chip. But then again we are on an Overclocking forum, what member here hasn't lessened the life of their chip?
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post #19 of 20
Thread Starter 
Ok, I'm not going to play with it anymore. thanks for your replies mates! thumb.gif
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post #20 of 20
I have found this out the hard way some people are reporting lower temps and more stable oc with a lower PLL voltage any where between 1.55-1.75 when running 24/7

In my personal experience with my chip yes it helps sustaining a higher oc ie 24hr prime blend using 90% of ram But it also took me months to work out it was causing a no post sometimes when system was cold it was so random(sometimes once a week or more) but after changing motherboards to maxmus 5 extreme I had a fault code 10, failed to initalise CPU This fault only occurs if my PLL is under 1.75v I havn't had this failed post for 4 weeks after changing PLL from 1.70 to 1.75v
This is with my 2500k and it is this chip it doesn't mean that other 2500k will have this problem.
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Edited by feznz - 2/9/13 at 8:28pm
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