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How long should I run P95?

post #1 of 18
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Currently running my i5-2500k at 4.5Ghz with 1.34v according to Cpu-z(I could of sworn i set 1.36 in bios). How long realistically should I be running Prime95? I've seen people running it for 7 hours and some even 24 hours. Is this absolutely neccessary? I've never pushed my system the the max for that long, maybe two hours at most and thats pretty rare.

Btw, Should PLL be enabled, disabled or auto? what does this do anyways?
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post #2 of 18
You're going to get 10 different answers from 10 different people on this topic. Some run for an hour others run for 24 hours but everyone does it differently. What I did for mine was 20 passes of IBT at max settings( 5 passes to check the OC) and then prime95 on blend for 8-10 hours. I just turned it on 2 hours before I went to sleep and checked it in the morning. I also ran IBT and prime95 small fft's together for an hour but that was just to see if I could. Check the temps before leaving it run unattended. My temps top out at around 68c-71c. Ultimately you'll need to game with it. If it doesn't crash in game I'd say it's fine.
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post #3 of 18
intel burn test is my new favorite program. it just beats the hell out of the cpu and get it much hotter than prime 95 can/does. does it pretty well and much faster. also there's occt you can give that a try.
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post #4 of 18
I like to test things out with Prime95 by letting it run for a few hours so I can watch the temperatures, then if it seems okay I leave it running overnight. Then I just do whatever it is that I'm going to be doing with my computer - gaming, photo editing, etc. If it works, I figure I'm doing all right. You can test things 100 different ways, and there's still no knowing if test 101 will cause a problem.

Computers, man, computers.
    
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post #5 of 18
24 hours is good if you want ridiculously good stability, although some people might think that's a bit excessive. Maybe 12-16 hours would be fine. Intelburntest with max memory and 50ish runs can test stability faster. Although running both is probably the best way to check how stable your OC is.
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post #6 of 18
Quote:
Originally Posted by rex4223;12873588 
You're going to get 10 different answers from 10 different people on this topic. Some run for an hour others run for 24 hours but everyone does it differently. What I did for mine was 20 passes of IBT at max settings( 5 passes to check the OC) and then prime95 on blend for 8-10 hours. I just turned it on 2 hours before I went to sleep and checked it in the morning. I also ran IBT and prime95 small fft's together for an hour but that was just to see if I could. Check the temps before leaving it run unattended. My temps top out at around 68c-71c. Ultimately you'll need to game with it. If it doesn't crash in game I'd say it's fine.

^^
This.

And here's an 11th answer.
I run prime for a grand total of 15 minutes. Yes--15 minutes.
The reason being:

If I can pass ONE loop (one loop takes 15 minutes, and this is usually 15 iterations of small FFT or around 10 iterations of "Blend"), then my computer is stable enough to "attempt" gaming without being so unstable that it could hose the OS. Also, RAM/memory errors (due to too high timings, too high frequency, etc), will *ALWAYS* be caught within the first 15 minutes, and usually within the first 1 minute. RAM errors are less likely to cause a BSOD than CPU errors, unless the RAM Errors are extreme. I Tried running my 1333 RAM at 1600, at auto timings and I forgot the voltage (1.58), and instead of a BSOD, every single prime blend thread failed in the first 20 seconds.

I let the games themselves be the stress test. I'd rather blow up my cpu by playing games, than running something that heats the chips up higher than even vantage CPU test or Deep Rybka 4 chess engine. But that's just me.

And also, in my experience, if you can't pass ONE 15 minute loop of prime blend, you *WILL* BSOD in your games (Depending on if the game is multi or single threaded; Single threaded games can run at significantly lower voltages).

I haven't done extensive testing at 5 ghz on my new CPU, as 4 ghz is my 24/7 settings--deliberately--so I have more cpu power to unlock later when I need it tongue.gif (the only thing I did was play black ops for awhile, with zero bsod's), but I'll try some Bad company 2 and other hard hitting stuff and see if that BSOD's or not.
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post #7 of 18
Can't argue with any of the posts here.
And usually do a 5-10 pass on P95. And lately a 2 hour pass on IBT.
I don't use this computer much. And if your OC is truly stable, you should be able to run either, indefinitely without errors.
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post #8 of 18
I did my final P95 on a 22 hour test. I wanted 24 hours but I was getting sleepy and figured 22 hours was enough.

While finding my stable OC, I'd BSOD during P95 usually within the first 4 hours. Once I made it past 12, I knew it was pretty stable. 22 hours is stable enough for me.

Hasn't BSOD on me real world.
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post #9 of 18
Eh, I always do 8 hours, that's just my preference for 24/7 stable. My 4.5 overclock has been stable with no crashes for about a week & a half now, so it has to be perfect. The reason I don't do anything under that is because I've let a test run once and it failed at like 7 hours and 34 minutes.
post #10 of 18
I usually do around 4 hours small FFT, then let it run for 10 hours overnight with blend test. Left on the default 15 min interval, 10 hours is the minimum amount of time required to pass every iteration in the blend test. If you manually change the interval time to 12 minutes, it would be 8 hours and so on...
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