OC 4Ghz at very low temperature

DavyBoy said:
Bulldog, different chips give you different QPI voltages to choose from mate..

I have had 4 920's, and my first two had totally different voltage settings for QPI in the BIOS compared to my current 2 920's...
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It pity that all Intel i7 core chipset could be great clocker, some don't and I think it really sad because the cpu chipset made by intel manufacturing should be the same cherry chip. I think it depend where the chipset made from, eg: china or uk or usa.
 
Every chip is different mate, there really isn't anything that can be done about this..

I don't know what it is that makes them have different requirements though..

The first chip I had was bad so it got replaced, with a faulty chip!!

Then that one got replaced, and I bought another one at the same time for my Fiancee's system.

::edit::

Looks like I am Prime stable with those settings as well guys:

primec.jpg
 
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Right ok, first of all, I had try out cpu clock skew at 100ps and set vcore at 1.30v, qpi/vtt at 1.11v, cpu pll at 1.30v and dram at 1.64v and done five hours prime95 blend test with my Corsair H50 with 2 x apache fans with a push-pull to the back exhaust rear.

It doesn't seem make any difference to me when I knock the qpi/vtt voltage down from 1.20v to 1.11v.

Here is my 5 hours blend test:

2el87kz.jpg
 
What does cpu clock skew and cpu pll actually do??

It seems that the F9e BIOS has made my system a lot more stable, can now actually go past the 5 minute mark on Prime without it making my PC hang
 
The F9E is much betters than F7 because it not stable my pc than. I revert back to F7 and got a lot of stable times, even my pc can do 4.6ghzor (F9E cant boot me 4.6ghz) and remember F9E is still on beta (can be bug or unstable)

I would stick to F7 if I were you. Rich from OCUK is 100% all the time.
 
I get the exact same temps as you bulldog on 4.2 but my crappy chip needs vcore of 1.38 even then i got BSOD after 1hr 20 of prime...will try messing with cpu pll and scew when i get my other fan for push/pull :D
 
bulldog147 said:
The F9E is much betters than F7 because it not stable my pc than. I revert back to F7 and got a lot of stable times, even my pc can do 4.6ghzor (F9E cant boot me 4.6ghz) and remember F9E is still on beta (can be bug or unstable)

I would stick to F7 if I were you. Rich from OCUK is 100% all the time.
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Well F9e seems to be better for me, for the reason stated above, so for the time being ill be sticking with it.

Done 2 hours now on Prime (blend), would never have gotten to that the way things were going on the F7 bios.

40ghzocdesktop.png



My QPI is set at 1.335, do you have to have at this to get it stable, and does the QPi value have an effect on temperature like Vcore?
 
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bulldog147 said:
The F9E is much betters than F7 because it not stable my pc than. I revert back to F7 and got a lot of stable times, even my pc can do 4.6ghzor (F9E cant boot me 4.6ghz) and remember F9E is still on beta (can be bug or unstable)

I would stick to F7 if I were you. Rich from OCUK is 100% all the time.
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Bulldog, you have got to remember that everyones system is different, what may work on one may not work on another. Its not wrong, just different.

No CPU is the same and while on my rig F9e is a better option, on yours it may not be. I think that was what Rich was saying, on the majority of his overclocks its worse, but that doesnt mean they all are.
 
lettuce said:
Well F9e seems to be better for me, for the reason stated above, so for the time being ill be sticking with it.

Done 2 hours now on Prime (blend), would never have gotten to that the way things were going on the F7 bios.

40ghzocdesktop.png



My QPI is set at 1.335, do you have to have at this to get it stable, and does the QPi value have an effect on temperature like Vcore?
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QPI will have an effect on temps and stability, too high can be as detrimental as too low. Try to reduce it slowly. I have mine set at 1.215v.
 
Gaidin109 said:
QPI will have an effect on temps and stability, too high can be as detrimental as too low. Try to reduce it slowly. I have mine set at 1.215v.
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Yeah, will do im just going to concentrate on the Vcore first, and see how low it can go, and then once i find the sweet spot look at lowering QPI.

So is blend the best method to use on Prime, if it passes Blend will it pass everything else, Small FFT's Large FFT's??, as i would have thought Large FFT would ahve been the best as that stress everything to the max doesnt it??

And what are peoples methods of finding a stable OC, do you guys run Linx/OCCT first then if that pass move to IBT, and then it that passes have the mammoth 8 hour session on Prime for a final check??
 
lettuce said:
Yeah, will do im just going to concentrate on the Vcore first, and see how low it can go, and then once i find the sweet spot look at lowering QPI.

So is blend the best method to use on Prime, if it passes Blend will it pass everything else, Small FFT's Large FFT's??, as i would have thought Large FFT would ahve been the best as that stress everything to the max doesnt it??

And what are peoples methods of finding a stable OC, do you guys run Linx/OCCT first then if that pass move to IBT, and then it that passes have the mammoth 8 hour session on Prime for a final check??
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do a 10 pass IBT on vhigh, then occt or linx, they are about the same. Prime blend is the best cos it tests everything, but takes ages. If you pass occt and IBT/Linx 20 pass on vhigh then its stable.
 
ibt for however many runs seem a good idea, then prime 95 + furmark overnight. Currently waiting on a 64 bit system to do ibt properly.

So we're pretty much all at 200x20 8-8-8 then? Can't be bad, next step is 210x20 I suppose
 
Linx 20 times max load is more than enough to stable your pc. I had stop doing prime95 blend test for 8 hours or more cos it take too long but linx is much quicker, take approx 1 hour and 30 minutes (depend on your ram size) and Linx will guarantee your maximum temperature, so, you will know how hot is your overclock stable.
 
bulldog147 said:
Linx 20 times max load is more than enough to stable your pc. I had stop doing prime95 blend test for 8 hours or more cos it take too long but linx is much quicker, take approx 1 hour and 30 minutes (depend on your ram size) and Linx will guarantee your maximum temperature, so, you will know how hot is your overclock stable.
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What should you set the RAM at, i selected 4GB earlier, but the prog crashed as the system ran out of memory, lol.
 
I always let LinX auto select the max memory.

I prefer to run IBT first (as a minor failure will freeze) with standard settings it takes no time at all, then run the LinX on max at 20 passes with stop on error.

Not a big fan of prime95 as its so long winded!
 
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