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FX-8350 can't run Prime95 @ Stock Settings. - Page 2

post #11 of 37
Thread Starter 
What is the safe voltage limit for the CPU NB? Highest I've gone previously was 1.22v (one step over stock).
    
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post #12 of 37
Prime 95 hates piledriver and bulldozer. Use OCCT for about the same amount of time you would normally run P95 (about 8 hours minimum for me) and 20 runs of Intel Burn Test on maximum. I guarantee the problem is not the UD3 unless your VRMs are overheating which is possible with an 8 core and 1.52v. You would not get a higher overclock (at least not to my knowledge) on a UD3 or a Crosshair V as long as both have sufficient cooling on the VRMs because they both have plenty of phases and heatsinks. Just have to keep the mosfets cool and continue as you normally would overclock. But anyways for the stress test, for AMD FX I would do 20 runs of Intel Burn Test on maximum first, then OCCT for 8 hours. If you overclock your CPU/NB or ram I would also do HCI Memtest for at least an hour. I am a stability freak XD, because in my experiences with my chip, I get pooped on every time I try to use an almost stable overclock.
post #13 of 37
Thread Starter 
4.6GHz @ 1.45v, CPU NB voltage bump to 1.22v, ran 10 passes of IBT on Maximum. Success! wheee.gif



I just really wish this thing would run Prime. Would make me feel a whole lot better.
    
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post #14 of 37
Quote:
Originally Posted by Baskt_Case View Post

4.6GHz @ 1.45v, CPU NB voltage bump to 1.22v, ran 10 passes of IBT on Maximum. Success! wheee.gif



I just really wish this thing would run Prime. Would make me feel a whole lot better.

You're getting there, keep pushing, you have the headroom.
post #15 of 37
Out of curiosity, why are you bumping the CPU NB?
Are you doing that because you're overclocking the RAM, or the NB? Or is it just for plain CPU stability?

This might explain why I can't get higher than 4.3GHz. :\
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post #16 of 37
I can run prime @5ghz no problems. It just takes dedication thumb.gif
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post #17 of 37
There is something about P95 and OCCT that FX chips just dont like. I could pass IBT at 4.8 all day long with no problems but it would collapse under OCCT in a matter of seconds. It took a LOT of work to get my current 4.5 stable under OCCT, P95 and IBT. I wish I could get a little higher but Im able to run this at 1.4V and keep CnQ enabled so I guess its not too bad. I would keep working on it til it can handle P95 cause there has to be a point where it will. HT Link increases can also help as well. Try LLC on Auto too. I settled on Ultra High but did have success with Auto. If youre using multiplier only, try a combination of FSB too. Some chips hit a wall with the multiplier but can squeeze out a little more with an FSB bump.
post #18 of 37
Thread Starter 
Quote:
Originally Posted by vinton13 View Post

Out of curiosity, why are you bumping the CPU NB?
Are you doing that because you're overclocking the RAM, or the NB? Or is it just for plain CPU stability?

This might explain why I can't get higher than 4.3GHz. :\

Just for plain CPU stability. I've tried at all costs to overclock as far as possible at the lowest CPU Vcore. So when IBT originally failed at 1.45vcore, I raised CPU NB one notch and it passed.

Furthermore, after success with IBT, I attempted OCCT, which failed after an hour. I've been reading some success stories about bumping CPU PLL voltage and decided to give it a shot. So right now CPU PLL voltage has been raised one step to 2.505v and I managed to get 7 hours of OCCT before failure.

So, to recap, I am IBT Max stable, and 7 hours OCCT at 4.6GHz @ 1.45v CPU @ 1.22v CPU NB @ 2.505v CPU PLL

Looking back through the OCCT logs, it failed at 8:30am this morning. Starting at 7am, there were some weird temperature drops that continued until failure an hour and a half later.

Coincidentally, Windows Defender is scheduled to scan at 7am everyday, and Security Essentials is set to scan at 8am everyday. One of the settings of Security Essentials is to limit CPU usage to 50% during it's scan. So, to eliminate their possible effects on my stress testing, I've disabled/uninstalled those items and will try OCCT again. I dont know why I installed MS Security Essentials anyway, I haven't used an anti-virus product in years.
Quote:
Originally Posted by gertruude View Post

I can run prime @5ghz no problems. It just takes dedication thumb.gif

If by dedication, you mean more money! It would appear you have a superior cooling setup to mine, and no doubt you did better than me in the silicon lottery. Previous testing has showed that my chip has a wall around 4.7GHz. Some chips just wont do it.

Think I'm gonna try a run of Prime now and see what happens. I'd be happy to just get a few hours out of it right now. The May Foldathon is 2 days away.
Edited by Baskt_Case - 5/18/13 at 10:39am
    
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post #19 of 37
Quote:
Originally Posted by Baskt_Case View Post

Just for plain CPU stability. I've tried at all costs to overclock as far as possible at the lowest CPU Vcore. So when IBT originally failed at 1.45vcore, I raised CPU NB one notch and it passed.

Furthermore, after success with IBT, I attempted OCCT, which failed after an hour. I've been reading some success stories about bumping CPU PLL voltage and decided to give it a shot. So right now CPU PLL voltage has been raised one step to 2.505v and I managed to get 7 hours of OCCT before failure.

So, to recap, I am IBT Max stable, and 7 hours OCCT at 4.6GHz @ 1.45v CPU @ 1.22v CPU NB @ 2.505v CPU PLL

Looking back through the OCCT logs, it failed at 8:30am this morning. Starting at 7am, there were some weird temperature drops that continued until failure an hour and a half later.

Coincidentally, Windows Defender is scheduled to scan at 7am everyday, and Security Essentials is set to scan at 8am everyday. One of the settings of Security Essentials is to limit CPU usage to 50% during it's scan. So, to eliminate their possible effects on my stress testing, I've disabled/uninstalled those items and will try OCCT again. I dont know why I installed MS Security Essentials anyway, I haven't used an anti-virus product in years.

Oh wow. Here I was thinking if I didn't touch the NB or the memory, I wouldn't need to touch the CPUNB voltage. sad-smiley-002.gif
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post #20 of 37
Thread Starter 
Well, I'm no expert, but logic tells me if I'm pushing the CPU at 4.6GHz, it is utilizing/communicating with RAM faster. Or communicating faster through the IMC (CPU NB), therefore maybe it needed a little voltage bump to deal with the increased work load.

I dunno, but it worked!
    
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