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post #3621 of 10702
Hmm, just wanted to share my experiences with PLL so far...

I tried going by Munaim's advice of lowering the PLL to 1.4v and work my way up from there. Nothing happens. Same stability as 1.8v, same degrees, same everything. Now, 1.4v SHOULD be some sort of limit value that'll produce reliable errors to work with, shouldn't it?

Maybe Gigabyte has some sort of protection against too low set PLL. Maybe some BIOS settings interfere with PLL. Maybe it's a BIOS bug.

I must say I'm a bit sceptical about the whole PLL thing. Some are lowering it to ~1.6v; that's a rather huge jump and a lot more than Intel's specs saying minimum 1.71 for SB. For what? Less heat? To me it seems like introducing more variables into the stable system equation, making it even harder to solve.

Yes, I've read Rellian's rather elaborate post http://www.overclock.net/14658240-post2993.html but he also disabled HT and ran RAM at default, already taking strain off of the CPU to play with lower voltages.

PLL's default voltage is 1.8v (more than RAM, more than all other CPU components) and for a reason. I can only wonder what the implications are?
    
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post #3622 of 10702
Quote:
Originally Posted by FoLmEr View Post
Hmm, just wanted to share my experiences with PLL so far...

I tried going by Munaim's advice of lowering the PLL to 1.4v and work my way up from there. Nothing happens. Same stability as 1.8v, same degrees, same everything. Now, 1.4v SHOULD be some sort of limit value that'll produce reliable errors to work with, shouldn't it?

Maybe Gigabyte has some sort of protection against too low set PLL. Maybe some BIOS settings interfere with PLL. Maybe it's a BIOS bug.

I must say I'm a bit sceptical about the whole PLL thing. Some are lowering it to ~1.6v; that's a rather huge jump and a lot more than Intel's specs saying minimum 1.71 for SB. For what? Less heat? To me it seems like introducing more variables into the stable system equation, making it even harder to solve.

Yes, I've read Rellian's rather elaborate post http://www.overclock.net/14658240-post2993.html but he also disabled HT and ran RAM at default, already taking strain off of the CPU to play with lower voltages.

PLL's default voltage is 1.8v (more than RAM, more than all other CPU components) and for a reason. I can only wonder what the implications are?
Interesting, well I found adjusting the PLL voltage according to munaim1's post has at least helped make the error codes more relevant to the error, I was getting 0x124 until I found my lowest stable setting getting me a 0x101 at 1.45v PLL. I'm currently running and still testing 4.9GHz at around 1.448v~ vcore. I have not adjusted the VCCIO or PCH voltages, but I may try enabling spread spectrum and see what effect it has, and whether I can lower my vcore as a result.

I can't say the PLL voltage being lower has helped my temperature considerably, if at all, but mainly it has helped me identify errors quicker and more accurately.
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post #3623 of 10702
Quote:
Originally Posted by Ixel View Post
I can't say the PLL voltage being lower has helped my temperature considerably, if at all, but mainly it has helped me identify errors quicker and more accurately.
Hm, I just thought about this for a little while and I think this is pretty accurate.

By my logic, undervolting (WEAKENING) the part of your CPU responsible for maintaining clock frequency (as in locking to a phase) is bound to accentuate potential flaws of other areas of the CPU. Flaws you probably wouldn't even have noticed had PLLv been at stock.
In effect you're increasing vcore to gain stability at a given clock frequency, and then lowering PLLv, decreasing the stability you just tried to achieve. And why? For the extra -3~6C during stress testing? Yeah, I'm not buying into this.
If anything, it makes you increase your other voltages more aggressively, too, due to giving your CPU worse conditions to operate under.

I do see it having a function tho. Suppose what I'm saying is correct; then it'll be another tool for testing in that finding "stability" w/ low PLLv, you can be sure that putting it back up to stock will only provide better conditions of keeping that "stability".

If I'm way off here, please, by all means, do enlighten me
    
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post #3624 of 10702
Quote:
Originally Posted by FoLmEr View Post
Hm, I just thought about this for a little while and I think this is pretty accurate.

By my logic, undervolting (WEAKENING) the part of your CPU responsible for maintaining clock frequency (as in locking to a phase) is bound to accentuate potential flaws of other areas of the CPU. Flaws you probably wouldn't even have noticed had PLLv been at stock.
In effect you're increasing vcore to gain stability at a given clock frequency, and then lowering PLLv, decreasing the stability you just tried to achieve. And why? For the extra -3~6C during stress testing? Yeah, I'm not buying into this.
If anything, it makes you increase your other voltages more aggressively, too, due to giving your CPU worse conditions to operate under.

I do see it having a function tho. Suppose what I'm saying is correct; then it'll be another tool for testing in that finding "stability" w/ low PLLv, you can be sure that putting it back up to stock will only provide better conditions of keeping that "stability".

If I'm way off here, please, by all means, do enlighten me
Well from my own personal experience. About 2 months ago when I got my original OC I was ONLY stable at 1.4v VCore and this was before I touched ANY other bios setting (literally everything at default). Then the other day I came across munaim talking about the Digi+VRM settings and the PPL voltage and decided to mess around.

I did all the Digi+VRM settings he recommended for my mobo AND I lowered my PLL to 1.700v and then did my 12+ Blend test, 79c highest core temp and stable.

I said what the hell if I have to be stable at 1.400v vcore and the PPL voltage is at 1.7v, may as well lower PLL a bit. I lowered it to 1.600v PLL and left my VCore at 1.400v, I did about 2 hours of 1344 and 1792 FFT's tests in Prime95 and still stable BUT with a lower temp of about 5c.

I'd say for adding no additional VCore and a lower PLL is a good thing in my case. Lower temps and same VCore = win fer me!
post #3625 of 10702
i lowered my pll voltage to 1.72 and my temps dropped 3-4 c
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post #3626 of 10702
Attachment 227979


now stable at 4.8
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post #3627 of 10702
Attachment 227980

Attachment 227981

Attachment 227982

Attachment 227983

my total is about 1025 this is low i think because multimedia numbers
i dont know if im running a different version or not set up properly if you look at the example on the first page that multi media integer is different than mine



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post #3628 of 10702
Thread Starter 
Quote:
Originally Posted by no_safe_HAVEN View Post
Well basically i went stable for 24+ hours. Seeing that i can read directions and didnt run Real temp or a custom blend for my 8GB memory the first 14 hrs. But hell just makes me more confident in my OC.
Quote:
Originally Posted by Hackcremo View Post
Succeed overclock my i5 2500K to 4.5GHz..next target 4.7Ghz..overclock is addiction..
Both added, Thank you for taking the time and contributing to the thread. Welcome to the club


Grab your sig and wear it proudly

Code:

[CENTER][SIZE="3"][B][THREAD=968053][FONT="Book Antiqua"][:clock:] The Sandy STABLE Club [:clock:][/FONT][/THREAD][/B][/SIZE][/CENTER] 


Quote:
Originally Posted by brian19876 View Post
Attachment 227979
now stable at 4.8
Updated your submission, your old submission is still available in the old section, you can make comparisons between your own chip and how much the voltage jumps betweek your overclocks etc.

Not sure whats up with sandra, but download and install from here: http://downloads.guru3d.com/Sandra-2...load-2056.html

Also please do me a favour and add each of the test, just like the other's have done so.


FoLmer

It does seem thatcertainly, with Asus mobo's, that the lowering of the PLL has had a positive effect on stability. Now whilst every chip is different so are the mobo's, whether they be by BIOS or whatever, the PLL voltage is only a recommendation that I think you should try, it may work for you it may not.

When working with things like this, yes you are considering intel recommendations, however when overclocking you 'kinda' take these shoddy recommendations out the window, I mean they couldn't even say what max voltage and operating temps are suppose to be SB. I mean how difficult is it saying the max volts and temps is 'this' for 24/7.

Just a note I use to run my 775 at 1.6v, which I eventually sold after 4 years, way out of intel recommendation and IIRC their also was a pll voltage recommendation which concides with increasing it to allow for stability. Sandybridge is completely different, now leaving the safety features on have no adverse affect on the stability but like I said every chip is different and the settings operate in a different way which have different effects than older gen chips.

Hope that helps you
Edited by munaim1 - 9/8/11 at 9:48am
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post #3629 of 10702

500 rep munaim? Awesome!!!! You deserve it man!
post #3630 of 10702
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Quote:
Originally Posted by fuloran1 View Post

500 rep munaim? Awesome!!!! You deserve it man!
Thanks bud, not bad for 5 months work lol
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