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Just how long do you really need to run prime 95 if you're going to do is play the latest games? - Page 2

post #11 of 53
8/15/12 at 9:55am
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Quote:
Originally Posted by Murlocke View Post

A blend loop doesn't complete until ~12 hours. You need to test every FFT if you want to ensure stability. That's really the bottom line, you can pass 4 hours of P95, but as soon as you hit an unstable FFT it could crash immediately. Which results in some games having issues, where other games won't.
12 hours of Prime95, always using the latest version (27.7 B2 currently?), with both error checkings and max memory set to 80% of your current memory. This was harder to pass than 100 passes of IBT/LinX on their highest settings on my 3770k. Prime 27.7 is pretty intense now, I would consider it all around superior to LinX/IBT with it's new AVX FFTs. However, I still test with both just to make sure.

So test every FFT at 15 minutes each = 17.5 hours? That's 99.9% stability?
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post #12 of 53
8/15/12 at 10:05am
Quote:
Originally Posted by ecksodia View Post

So test every FFT at 15 minutes each = 17.5 hours? That's 99.9% stability?

It should be about 12 hours. They may have added more FFTs in later versions.

If I can pass 12 hours of the latest Prime95, and 50+ loops of IBT on Extreme.. i've never had issues pop up on any of my builds relating to my overclock. I have old builds that friends have bought from me still rocking the same overclock 5-6 years later. It really depends on how stable you want to be, I prefer to overkill it. tongue.gif
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post #13 of 53
8/15/12 at 10:05am
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Quote:
Originally Posted by ecksodia View Post


i5-3570k, edited the OP.
I read a post on how one WHEA 19 error or something while running prime means you're unstable. Is that it? That's the same post that said you need to run 17.5 hours.

 

Ok.

 

For the 3570K, the best stress test right now is Prime95's Custom Blend test so that you can make Prime95 use about 90% of your memory instead of being stuck with the 1024 MB default.  To select the Custom Blend test, select Custom when Blend is selected.

 

The amount of time to run can depend.  Prime95 v27.7 build 2 has exactly 82 FFT sizes in its Blend test, and so at 15 minutes per FFT, this is a minimum of 20.5 hours.  However, I tested all 82 FFTs at 1 minute each, and it took 105 minutes (this was actually done on purpose to see how many FFTs there are).  I expected about 82 minutes!  So that tells me why people are recommending about 24 hours.

 

The WHEA stuff is no good to me because I have no errors in there, and there should be several due to going from stock all the way to 4.7 GHz.  My system wasn't stable throughout the entire overclocking process.

 

So, I personally can only trust something intense such as Prime95.  If a system can remain stable while running Prime95 for that long, then it's stable.

 

Linpack is inferior unless you have a linpack test that also uses the AVX instruction set.  However again, Windows 7 SP1 is required.

 

That's about all I can think of.

It's like advanced alien technology! :)
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post #14 of 53
8/15/12 at 10:06am
Interesting thread. In addition to this, JJ from Asus in that Newegg.com video with him and Paul going over overclocking says that Prime95 isn't good to use to stress test Intel CPUs. Most of you experienced guys seem very comfortable using Prime95 though. JJ recommends using AIDA64. Does it matter? Just adding this in case the OP is interested.

http://www.youtube.com/watch?v=4mkGQhE1o2w
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post #15 of 53
8/15/12 at 10:08am
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Quote:
Originally Posted by Rickythedragon View Post

Interesting thread. In addition to this, JJ from Asus in that Newegg.com video with him and Paul going over overclocking says that Prime95 isn't good to use to stress test Intel CPUs. Most of you experienced guys seem very comfortable using Prime95 though. JJ recommends using AIDA64. Does it matter? Just adding this in case the OP is interested.
http://www.youtube.com/watch?v=4mkGQhE1o2w

 

Yeah, well AIDA64 also costs money.  So, while I trust JJ, I don't trust him on this because he is trying to promote software that costs money.  Sure there's a trial version, but you have to pay if you want to keep it.

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post #16 of 53
8/15/12 at 10:13am
Quote:
Originally Posted by Rickythedragon View Post

Interesting thread. In addition to this, JJ from Asus in that Newegg.com video with him and Paul going over overclocking says that Prime95 isn't good to use to stress test Intel CPUs. Most of you experienced guys seem very comfortable using Prime95 though. JJ recommends using AIDA64. Does it matter? Just adding this in case the OP is interested.
http://www.youtube.com/watch?v=4mkGQhE1o2w

AIDA is stable for me with a lot less voltage than Prime95 needs. The temps AIDA gives also raise eyebrows, they are very low in comparison. I would not listen to a word they say, I've proven to myself time and time again AIDA doesn't give 100% stability.

I think they just don't want people running Prime95 because it will result in near max temps on high overclocks. It doesn't really matter though, game temps will be much lower and running a processor hot for 12 hours won't kill it. All modern processors will throttle and shutdown before it takes damage, unless you run it like this for awhile (days, months) the risk is pretty much nothing.

There are people that have hardware fail during testing, but that's because the hardware itself was on it's way out. It's the same reason why people say you should fully test hard drives before you use them. Burn those parts in, make sure they are working and can handle higher than "real world" stress.
Edited by Murlocke - 8/15/12 at 10:15am
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post #17 of 53
8/15/12 at 10:21am
Quote:
Originally Posted by Rickythedragon View Post

Interesting thread. In addition to this, JJ from Asus in that Newegg.com video with him and Paul going over overclocking says that Prime95 isn't good to use to stress test Intel CPUs. Most of you experienced guys seem very comfortable using Prime95 though. JJ recommends using AIDA64. Does it matter? Just adding this in case the OP is interested.
http://www.youtube.com/watch?v=4mkGQhE1o2w

AIDA is no match for P95 for testing for stability in my experience. Both of my Sandy Bridges will BSOD in minutes doing a Prime blend on the volts AIDA could stress with for over a hour.
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post #18 of 53
8/15/12 at 10:21am
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In all honesty I once had an i5 750 that would fail prime95 with the oc I had however I could do everything I wanted on my computer with no problems at all.

I did monitor the temps though because you dont want to burn up your components.
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post #19 of 53
8/15/12 at 10:27am
Very interesting! Thanks for the replies!
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post #20 of 53
8/15/12 at 6:18pm
The longest I managed to run prime was two hours. Wish I could go longer but I just don't have the time.
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