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OC i7 950 @ 4.4 Stability issues.

post #1 of 11
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http://valid.canardpc.com/show_oc.php?id=1819692

OCing noob here. I just reached 4.4GHz for a 24/7 OC and im finding it hard to get a stable clock.

I was running bc2 to test and about 10 mins in the exe would close. :S

Any ideas on where to go from here?

Edit: tried to bench with folding and it crashed with 0xD1
Edited by anthony92 - 5/15/11 at 12:41am
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post #2 of 11
Well that would mean you not stable...

4.4 is a bit of a reach, were you stable at 4.2 or 4.0? If so what were your voltages?

If your were not I suggest trying to get stable there first and work your way up. For a 24/7 4.4 OC your going to need somewhere in the 1.45v range and some pretty good cooling...

On averege the 950 needs vcore around 1.30 - 1.35v for 4.0 and 1.35 - 1.42v for 4.2.. VTT & QPI voltages should be around 1.35v or lower per Intel Datasheets
Edited by 10acjed - 5/15/11 at 4:39am
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post #3 of 11
Have you heard of Prime95 or LinX?
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post #4 of 11
Quote:
Originally Posted by jasjeet View Post
Have you heard of Prime95 or LinX?
^^ that too.....

Prime95 Blend test for 10 - 12 hours is what I call stable...
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post #5 of 11
Thread Starter 
not exactly i kinda just went to 4.4 like a noob hoping for the best. considering it wouldn't past 2 minutes of folding i'd consider that unstable haha. I was planning on using prime95 and linX after but i saw no point if it couldn't fold first . Vtt and Qpi were left at auto so that could have been a problem. If i know my vcore is stable. But it still continues to crash. should i move the values higher on which voltage up a notch each time. and if so how high should i go before i should call it and say my cpu can't do X clock. Ill try it tomorrow because i have to wake up early and cbf now .
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post #6 of 11
Quote:
Originally Posted by 10acjed View Post
Well that would mean you not stable...

4.4 is a bit of a reach, were you stable at 4.2 or 4.0? If so what were your voltages?

If your were not I suggest trying to get stable there first and work your way up. For a 24/7 4.4 OC your going to need somewhere in the 1.45v range and some pretty good cooling...

On averege the 950 needs vcore around 1.30 - 1.35v for 4.0 and 1.35 - 1.42v for 4.2.. VTT & QPI voltages should be around 1.35v or lower per Intel Datasheets
+1
shoot for a stable overclock! 4.0ghz should be fairly easy to achieve ! Then slowly juice it!!
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post #7 of 11
I think you havent got much of a lcue what your doing, please read up on the i7 Ocing guides before you start messing around, with the settings.

You got to have a pretty golden chip to get 4.4Ghz at a decent Vcore and temp.

Aim for 3.8Ghz first as all chips can manage this, then go for 4Ghz. By then you will know what to do to push more.

Uncore needs to be 2x Ram Multi. QPI Link needs to be on lowest option, but not "slow mode". 3.8Ghz should be fine with 1.28v Vcore and 1.25v Vtt (Load Line Calibration - Disabled). Disable speedstep c1e etc.

Run LinX for 10 runs to check Vcore, run Prime 95 for an hour to see temps and general stability, will give you an idea how good the chip is with settings above. If you think there is more potential push to 4Ghz. Do another small run, if you tyhink there is more potential push more. One you reach a temp limit or Vcore limit, do a longer run of Prime95 to finalise the OC, if it fails scale back.

BSOD Codes
0x101 = increase vcore
0x124 = increase/decrease vcore or QPI/VTT...have to test to see which one it is
0x0A = unstable RAM/IMC, increase QPI first, if that doesn't work increase vcore
0x1E = increase vcore
0x3B = increase vcore
0xD1 = QPI/VTT, increase/decrease as necessary
0x9C = QPI/VTT most likely, but increasing vcore has helped in some instances
0x50 = RAM timings/Frequency or uncore multi unstable, increase RAM voltage or adjust QPI/VTT, or lower uncore if you're higher than 2x
0x116 = Low IOH (NB) voltage, GPU issue (most common when running multi-GPU/overclocking GPU)
0X109 = Not enough or too Much memory voltage
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post #8 of 11
Thread Starter 
Currently at 4.2 (200x21), load temp of 70 with a Vcore of 1.38, I probably can go lower i just got lazy and a QPI/VTT of 1.25, All other voltage setting are auto. I disabled the LLD and others as suggested. (HT)

Has not crashed while running F@H like it usually would. I'll Run prime95 now to confirm its stability for a couple hours.


I'm unsure of how i would go about increasing the clock. Would i move i slowly up, but then the ram clock will not be 1600 any more. Or would i adjust the multiplier to 22. But i heard that this cpu doesn't like even numbers/unstable.
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post #9 of 11
Thread Starter 
4.2 Completely stable. one hour of folding and 7 hours of prime95 blend test. Didn't fail.

should I change the multiplier to 22 now?
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post #10 of 11
Quote:
Originally Posted by anthony92 View Post
4.2 Completely stable. one hour of folding and 7 hours of prime95 blend test. Didn't fail.

should I change the multiplier to 22 now?
Yeah, go for it...

You may need to back down the BCLK, try going for 4.3 then 4.4...


Those temps are pretty sweet if your F@H with -smp 8 and bigadv.. I have to back down my OC or run -smp 6 to keep temps at 70c or less...
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