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How long should I run P95? - Page 2

post #11 of 18
Quote:
Originally Posted by Falkentyne;12874783 
^^
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 LOW timings, too high frequency, etc), will *ALWAYS* be caught within the first 15 minutes, and usually within the first 1 minute. Wrong.
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.
First and foremost it depends on what you're testing. Is it an AMD or Intel? Is it LGA 775, 1366, 1156, etc. You test each one differently.

AMD's, it seems, are a lot more sensitive to memory errors; and no you will not always, hell not even half of the time will you find them. It just takes time. I've had memory errors after 14 hours of prime, and guess what? It was unstable.

THe best stress tester out is F@H. It is so sensitive to errors that you'll find out in a great big hurry.
Quote:
Originally Posted by kenolak;12874804 
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.

IBT is a useless test for AMD's. An OCN member ran 500 passes on his 1090T, that's 18.5 hours, and passed with flying colors. Then he fired up F@H and his rig BSOD'd within 5 minutes. Then he subsequently removed IBT.

Folding at home is the best stress tester. Although prime is good for initial stability tests.
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post #12 of 18
Quote:
Originally Posted by BlackOmega View Post

IBT is a useless test for AMD's. An OCN member ran 500 passes on his 1090T, that's 18.5 hours, and passed with flying colors. Then he fired up F@H and his rig BSOD'd within 5 minutes. Then he subsequently removed IBT.
Can't argue that much. But I have had memory errors near instantly (2 -5 passes at max memory) with IBT before p95 would error(with max memory).
But I agree 100% it's all about the system. Some do need to be tested differently than others.
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post #13 of 18
Quote:
Originally Posted by BlackOmega View Post
First and foremost it depends on what you're testing. Is it an AMD or Intel? Is it LGA 775, 1366, 1156, etc. You test each one differently.

AMD's, it seems, are a lot more sensitive to memory errors; and no you will not always, hell not even half of the time will you find them. It just takes time. I've had memory errors after 14 hours of prime, and guess what? It was unstable.

THe best stress tester out is F@H. It is so sensitive to errors that you'll find out in a great big hurry.



IBT is a useless test for AMD's. An OCN member ran 500 passes on his 1090T, that's 18.5 hours, and passed with flying colors. Then he fired up F@H and his rig BSOD'd within 5 minutes. Then he subsequently removed IBT.

Folding at home is the best stress tester. Although prime is good for initial stability tests.
I see your point. I guess just as the first poster said, everyone is going to have a different answer to this In my experience, every time the memory or chipset were unstable, each and every thread of Prime95 blend would crash within the first few minutes. This happened on my socket 775 when I tried to run cas 3 at too high of a FSB, when I pushed the FSB too high on a quad, and on my 1155 when I ran my RAM past its rated frequency. But I guess these were "serious" errors. Borderline errors are so tricky to catch it's rediculous. And no way I'm going to run ANY stress tester for 12 hours just to catch a borderline error and say I'm unstable....

Basically, my point is, on *my* systems, if I can pass ONE 15 minute loop of prime 95 blend, then I can use the system without hosing the registry, FAT or boot sector, thanks to memory errors. So let's leave it at that, ok?
(many years ago, I wiped the boot sector of a windows 95 machine, by running a 166 mmx @ 262.5, at the default voltage of 2.8v (when it needed 3.2v). Attempting to boot=good game. And I once scrambled the windows registry on a pentium 4, by trying to run cas 3 ram at cas 2 (instead of cas 2.5).

BTW, I *NEVER* claimed in my post that I am fully stable if I pass prime for 15 minutes blend. I claimed I was stable enough to *attempt* to run games without blowing up the computer.
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post #14 of 18
Quote:
Originally Posted by rex4223 View Post
You're going to get 10 different answers from 10 different people on this topic. .........
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.
Really summed it up there...

I run it 10+ hours as well, it was the rule of thumb when I first got into overclocking, so "if it aint broke dont fix it"

alot of people now adays say and hour or so... IDK, I feel better with 10 or more... I have got errors in 6 - 8 hours, a bump in vcore fixed it every time..
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post #15 of 18
honestly if it passes 20 runs of ibt and 2-4 hours of intense game play then its stable no need to beat your chip up for days/hours at a time for what ? i see checkin temps but all your doing is heating the chip up more then it will ever be under normal... so honestly ifit passes playing 4 hours of games and 20 runs or 45 mins of blend its stable why degrade your chips for nothing
post #16 of 18
Quote:
Originally Posted by Nw0rb View Post
but all your doing is heating the chip up more then it will ever be under normal...
My CPU temperatures are actually 2c higher playing BC2 then running Prime95. Eeep! That game is my favorite stress test. Of course. it's a real bummer when your computer gives up during your best round ever.
    
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post #17 of 18
thats cause you have poor air circulation my temps hit mid 60s prime and ibt bc2 only its 50 to low 50's max so idk what your talking about i can play sc2 for 4 hours and temps never break 50
post #18 of 18
question to enable cpu pll overvolt, Ive found that the wall on my 2500k was 4.4. Anything over that needed it enabled, so you may need it enabled for 4.5.

It may differ from cpu to cpu though.

Also I agree bad company 2 draws more than any other game out there, but its still no where near close to maxing out the cpu.

Bad company 2 draws 70 watts,
prime 95 draws 90 watts
linpack avx draws 125
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