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12+hour prime. Is it really necessary?

post #1 of 63
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Is it really necessary to run prime for 12+ hours?
To me it seems like a little overkill...

Also, Intel Burn Test vs. Prime95, which is better?
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post #2 of 63
No, 5 seconds is enough for me
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post #3 of 63
No.

Prime95 IMO.

6hrs should do, but I'd advice 12+ if you want to be sure nothing can go wrong in the future.
post #4 of 63
I prefer 24-72 hours, in addition to at least a few other stability tests.

I have seen many OCs fail after 20+ hours of Prime or LinX due to the same errors that were causing intermittent instability in real apps.
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post #5 of 63
Stability tests are an odd thing, i've overclocked many times and my way of stability testing was running a 5x loops of 3DMark. And these systems are still running fine with those same OC's 3years later. But to each their own....
 
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post #6 of 63
It depends on how stable you want to believe your system to be. 12 hours Prime95 is a good start. It is possible you may develop errors later and may have to adjust your CPU and memory overclock.

The longer it runs without errors, the more confidence you can have that it is stable.
post #7 of 63
Thread Starter 
It just doesnt make any sense to me, its like saying im gonna run my car at redline for 5 hours to make sure i can drive it in normal conditions. I mean no matter what programs your running theres no way that the cpu will be at 100% load for that long. A couple hours i understand, but im reading all these post of 12+ hours and ppl saying that the minimum is 24 hours...I just dont understand the reason behind a 12-24h test
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post #8 of 63
Quote:
Originally Posted by PoNGxB View Post
It just doesnt make any sense to me, its like saying im gonna run my car at redline for 5 hours to make sure i can drive it in normal conditions. I mean no matter what programs your running theres no way that the cpu will be at 100% load for that long. A couple hours i understand, but im reading all these post of 12+ hours and ppl saying that the minimum is 24 hours...I just dont understand the reason behind a 12-24h test
Doing it for longer just increases the chance of having an error. In real world use with an unstable OC you could get random errors any time.
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post #9 of 63
Quote:
Originally Posted by PoNGxB View Post
It just doesnt make any sense to me, its like saying im gonna run my car at redline for 5 hours to make sure i can drive it in normal conditions.
Bad analogy.

It's more like running the car at redline for five hours, and have it be in the same apparent condition as before you tested it, to make sure it can run for the next 5,000 without maintenance or failure.

Quote:
Originally Posted by PoNGxB View Post
I mean no matter what programs your running theres no way that the cpu will be at 100% load for that long.
Even if this assertion wasn't blatantly false (there are many real world apps that can use every cycle of my 12 logical cores for hours, days, months, or longer, continually), you don't need to be running full load all the time for errors to crop up.

Stress testing is about packing the most calculations into the shortest period of time so you can identify problems as quickly as possible.

If I have a program that is crashing every 10 days, I do not want to have to wait 10 days between each change of settings to see if I need to reevaluate things.

Quote:
Originally Posted by PoNGxB View Post
A couple hours i understand, but im reading all these post of 12+ hours and ppl saying that the minimum is 24 hours...I just dont understand the reason behind a 12-24h test
As I've said, I've had errors that were causing annoyances, or damage to my data, that were caused by instabilities that were not reliably recreated without upwards of 20 hours of stress testing.
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post #10 of 63
I think that on the first gen core processors Linx or IBT works better than Prime95.

Edit: 3-500 runs on my i7 875k was more than enough.
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