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post #451 of 641
Quote:
Originally Posted by orndorf77 View Post

is a rog realbench 1 hour stress test enough time to determine if my cpu is stable ? i overclocked my i7 4770k to 4.3ghz i used 1.248v in my bios i then ran rog realbench for 1 hour straight my max temperature was 76c. did i stress test my cpu long enough ? and if i did not how much time should i stress test my cpu for ?

Honestly stability is relative in some ways. Use the pc a bit and see how it does gaming and such. I usually do a few different prime test for a total of 4hrs and have never had issues with a stable overclock. Im actually downloading that Asus program/suite now to see how it works.

Basically if it doesnt crash on you....technically its stable biggrin.gif It depends on your work load, and gaming usually isnt too hard on a cpu in comparison to a stress test.
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post #452 of 641
Quote:
Originally Posted by 66racer View Post


Honestly stability is relative in some ways. Use the pc a bit and see how it does gaming and such. I usually do a few different prime test for a total of 4hrs and have never had issues with a stable overclock. Im actually downloading that Asus program/suite now to see how it works.

Basically if it doesnt crash on you....technically its stable biggrin.gif It depends on your work load, and gaming usually isnt too hard on a cpu in comparison to a stress test.

 

During my time here, I've seen things that force me to disagree with this. For example: "My rig has been stable for 6 months and now I'm seeing these problems. What the hell is going on? Is my motherboard or CPU dying?" I usually ask them what they've done for stability testing, and the answer I always get is something to the effect of "Yeah, it is perfectly stable. I tested it for 6 hours in Prime95 and it was fine the entire time. So, what's going on? Do I have to RMA something?" My answer is always, "No. You just didn't test the stability of your system well enough."

 

With subtle instability like that, not only can you run into problems later on (a day later, a week later, a month later, a year later, etc.), but you can have data corruption. For this reason, I will always recommend the most demanding and extreme stability testing - especially with a respectable overclock. For something tiny like 4 GHz for Sandy/Ivy/Haswell,, pff... I would almost say don't test it at all and just let your normal use be the test. As you overclock higher and higher though, it becomes more and more important to test the stability properly and thoroughly.

 

I remember overclocking my E2180 to 3.0 GHz. Everyone recommended 9 hours of Prime95's Small FFTs test, so that's what I did. It stayed stable for all 9 hours, so I thought that I was done. However, I was still seeing minor problems that looked like minor bugs in some of my programs. So, I decided to see if my system would stay stable for 12 hours. Well, lol, it failed just after 10 hours. So, I worked towards making it stable enough for 12 hours. I ended up making past 12 hours and I even let it go for 14 hours and then I stopped it because I wanted to use my computer. The result? Those minor bug-like problems completely disappeared.

 

Today, I understand why: there are dozens and dozens of FFTs that Prime95 can go through, and each one is different from the rest. In Prime95 27.9, the Blend test has 82 FFT sizes and it takes about 24 hours to get through all of them at least one time each. So, with Prime95, the length of time isn't as important as most of us think.


Edited by TwoCables - 5/14/14 at 4:50pm
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post #453 of 641
Quote:
Originally Posted by TwoCables View Post

During my time here, I've seen things that force me to disagree with this. For example: "My rig has been stable for 6 months and now I'm seeing these problems. What the hell is going on? Is my motherboard or CPU dying?" I usually ask them what they've done for stability testing, and the answer I always get is something to the effect of "Yeah, it is perfectly stable. I tested it for 6 hours in Prime95 and it was fine the entire time. So, what's going on? Do I have to RMA something?" My answer is always, "No. You just didn't test the stability of your system well enough."

With subtle instability like that, not only can you run into problems later on (a day later, a week later, a month later, a year later, etc.), but you can have data corruption. For this reason, I will always recommend the most demanding and extreme stability testing - especially with a respectable overclock. For something tiny like 4 GHz for Sandy/Ivy/Haswell,, pff... I would almost say don't test it at all and just let your normal use be the test. As you overclock higher and higher though, it becomes more and more important to test the stability properly and thoroughly.

I remember overclocking my E2180 to 3.0 GHz. Everyone recommended 9 hours of Prime95's Small FFTs test, so that's what I did. It stayed stable for all 9 hours, so I thought that I was done. However, I was still seeing minor problems that looked like minor bugs in some of my programs. So, I decided to see if my system would stay stable for 12 hours. Well, lol, it failed just after 10 hours. So, I worked towards making it stable enough for 12 hours. I ended up making past 12 hours and I even let it go for 14 hours and then I stopped it because I wanted to use my computer. The result? Those minor bug-like problems completely disappeared.

Im not disagreeing with you, but with 4hrs of prime (2hr blend, 1hr small fft, 1hr 1344/1344 fft, 1hr 1792/1792 fft) I have had good luck with my intel overclocks (2500k, 3570k, 2700k, amd 1100t and fx-8150 I used to run 4hrs each of blend and small fft). Of course if any weird issues arise the first step would be to retest stability.
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post #454 of 641
Quote:
Originally Posted by 66racer View Post


Im not disagreeing with you, but with 4hrs of prime (2hr blend, 1hr small fft, 1hr 1344/1344 fft, 1hr 1792/1792 fft) I have had good luck with my intel overclocks (2500k, 3570k, 2700k, amd 1100t and fx-8150 I used to run 4hrs each of blend and small fft). Of course if any weird issues arise the first step would be to retest stability.

 

Then you're either good at overclocking, or lucky.

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post #455 of 641
Thread Starter 
Quote:
Originally Posted by 66racer View Post

Honestly stability is relative in some ways. Use the pc a bit and see how it does gaming and such. I usually do a few different prime test for a total of 4hrs and have never had issues with a stable overclock. Im actually downloading that Asus program/suite now to see how it works.

Basically if it doesnt crash on you....technically its stable biggrin.gif It depends on your work load, and gaming usually isnt too hard on a cpu in comparison to a stress test.
if gaming does not push your cpu as hard as stress testing does then how come my computer crashed after gaming for 25 minutes yesterday and my computer passed a half hour rog realbench stress test and it passed 1 hour of prime95 stress testing ? I wound up having to bump up my voltage from 1.242v to 1.248v .
    
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post #456 of 641
Quote:
Originally Posted by orndorf77 View Post


if gaming does not push your cpu as hard as stress testing does then how come my computer crashed after gaming for 25 minutes yesterday and my computer passed a half hour rog realbench stress test and it passed 1 hour of prime95 stress testing ? I wound up having to bump up my voltage from 1.242v to 1.248v .

 

Because half an hour of RealBench and 1 hour of Prime95 is nowhere near being enough to declare stability.

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post #457 of 641
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Originally Posted by TwoCables View Post

Then you're either good at overclocking, or lucky.

I will take lucky over good any day biggrin.gif

But the way I mentioned that I test does give the cpu some variety. As always, since my pc use doesnt earn me an income, If one of these days I get some weird crash its no big deal and I can retest stability/troubleshoot from there. Thankfully its been over a year on this 2700k at 4.8ghz and havent had any issues. Thats her bleeding edge overclock too, she DOES NOT like 4.9ghz or higher but I can bench at 5.0ghz. I have even done 12hr+ blocks of folding at 4.8ghz too without problems thankfully at 4.8ghz.
Quote:
Originally Posted by orndorf77 View Post

if gaming does not push your cpu as hard as stress testing does then how come my computer crashed after gaming for 25 minutes yesterday and my computer passed a half hour rog realbench stress test and it passed 1 hour of prime95 stress testing ? I wound up having to bump up my voltage from 1.242v to 1.248v .

Well sounds like you need to do some more testing tongue.gif Since your still learning to overclock its probably better for you to run longer loops like twocables mentioned, I dont think I should have suggested to you that less than 12hrs is stable. I did not say that a 1hr run would prove stability either. I mentioned I do 4hrs of prime testing before I start feeling good enough to game and such. There are some people that say 24hrs is stable, some that say 12hrs is stable, some like me that say 4-6hrs, and there are even some that will say 2hrs, but honestly I think my 4hrs is the bare minimum.
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post #458 of 641

With Prime95, the length of time is mostly irrelevant. Start paying attention to which FFT size you're at every 20 minutes or so. You'll see that it's about the FFTs that you can get through, not so much the length of time. So, in Prime95, it's not the exact same type of stress for the entire length of time that you run it. It changes to something completely different about once every 17-18 minutes.

 

To do one full run of Prime95, I would recommend 24 hours. Anything less is less than 100% of Prime95's total amount of FFTs.

 

Also, based on the result of being able to pass 30 minutes in RealBench but still having issues, I would say that maybe I was right about 8 hours being the best.

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post #459 of 641
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I just
Quote:
Originally Posted by TwoCables View Post

Because half an hour of RealBench and 1 hour of Prime95 is nowhere near being enough to declare stability.
I ran realbench last night for 1 hour and today I ran realbench for 2 hours and my cpu passed. my max temperature was 77c . I also ran prime95 for a half hour and my max temperature was 78c . how long dose it take for your prime95 temperature to reach the highest it going to get ? is a half hour run long enough for my cpu to reach the hottest its going to get ?
    
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post #460 of 641
Quote:
Originally Posted by orndorf77 View Post

I just
I ran realbench last night for 1 hour and today I ran realbench for 2 hours and my cpu passed. my max temperature was 77c . I also ran prime95 for a half hour and my max temperature was 78c . how long dose it take for your prime95 temperature to reach the highest it going to get ? is a half hour run long enough for my cpu to reach the hottest its going to get ?

Maybe, depends on if you also ran small fft or blend....you can run it 1hr and see if temps are higher than at 30mins.
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corsair f120ssd/seagate 1TB Asus cd/dvd burner Antec Kuhler 920 semi-custom loop (2 radiators) win7 professional 64bit 
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Gateway 23" 1920x1080 corsair ax850 Rosewill blackhawk w/hdd bay mod logitech mx518 
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