How long should I leave prime95 running?

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I know most people leave it on overnight but I can't do that, my dad's an electrical engineer yet he thinks leaving the router on could burn down the house :eek:

If I let it run for maybe 3 hours or so would that be a good enough stress test?
 
People will all give different answers to this but for me 3 or 4 hours would be plenty. I also prefer using other things to stress a system like 3dmark11 or cinebench 11.529 these are good at finding instability.
 
Thanks, I'll let it run for another 2 hours or so as its been on since 5.

Although its still only just hitting around 50 degrees C, although the system hasn't been overclocked yet so I don't know how hot the stock should be?

I'm getting the temps from hwmonitor
 
If you're looking to only test CPU stability, running Prime Small for a 3-4 hours will give a good indication of stability, but ideally you want to run Prime Blend for a good 12-24hours.
 
Hmmmmmm your only proving your system can run Prime by running prime at all!!!!

If you insist on wasting electricity one hour is more than enough.

Just use your computer as you would normally to test stability!!
 
1 hour isn't enough, the entire point of using extensive stability testing is to remove any doubt that it's your hardware.

If you don't, how do you know it is your overclock, or a software problem? How do you know that your computer isn't crashing but is in fact causing data corruption that you won't pick up immediately but years into the future to find your photos of your kids graduation are corrupted.

There can be very good reasons to doing proper stability testing if you're overclocking, you want to push your hardware as hard as possible to remove any chance of that happening, especially when you bear in mind that cooling and PSUs etc age and deteriorate.
 
has anyone lost pictures from overclocking? not ones being edited when the pc crashes, but ones just on the hard drive..
How does it get onto the drive...

It doesn't have to be photos, it's just an example, it could be anything. The point is, if you use your PC for anything remotely important not doing any sort of rigorous stability is down right moronic. Sure, if you just use your PC for fluff like gaming then no real harm done other than the annoyance of random crashes when gaming in the future and subsequent threads on here asking what the problem is and why is my overclock no longer stable.
 
how about Intel Burn Test?
its usually finds an unstable overclock in less than 1 hour, but 5hrs would be better.
as far as running games to test, i would never do this, as u dont know what can get corrupted with a bsod or sudden shutdown.
 
has anyone lost pictures from overclocking? not ones being edited when the pc crashes, but ones just on the hard drive..

If you're running too few volts you can experience random errors. These wouldn't be picked up by a fixed stress test and may never cause an application to crash. They would however be sufficient to corrupt your data. Most novice overclockers use far too few volts thinking they are stable, only to complain of random 'unrelated' issues months later. If you want to avoid corruption, add plenty more volts than what 'appears' stable.
 
Intel burn test 50 passes set the cores to how ever many you have and custom ram to whatever "free" memory you have under task manager not available ram free ram.

Be careful though IBT temps are a good 10c or more higher than prime / gaming temps should take about an hour or less I would say 50 passes of that is pretty damn bulletproof.
 
I think its just personal preference. Ill let you know my experience tho. I had a 4.6ghz OC 3 days ago. Ran it before i went to bed and all was well in the morning. I fought to myself, "im going work now, might aswel leave it on." When i returned, prime had fatal errors on 2 threads after 11hours. I up the voltage and ran another test. 24 hours and no problems
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Ran 3D mark also and all good.

I have had many test fail after 4/5/6 hours and once after 11 hours.

Its up to you, what you feel comfortable with. Im sure if you system was unstable then games would show this sooner or later.
 
One thing I found with Prime95 is I run it and everything is fine with low temps.

Then I start playing games and the CPU temps are actually higher due to 4 gpus doing their stuff. I do not understand how prime95 can be used to tell if your system is stable if your not using half of it ie your gpus.
 
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