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How to get a stable overclock what's the best to test ? - Page 4

post #31 of 52
Quote:
Originally Posted by ladcrooks View Post


Shave of the shelf life of cpu, cos that's all you are doing. Tell me what applications you are going to use that will demand 100% cpu for hrs on end? None! Except all this stupid stress test rolleyes.gif

Sorry for ranting, stressing for hrs on end, you dont need it! I do 30mins max purely to find what my temps are going to be. Tell me, is somebody's else computer better if it passes 24hrs stress test than somebody who only done a measly 8hrs? biggrin.gif

What are you going to do if it passes 8hrs and then it gets the blue screen of death or any other dilemma a week later? Blame prime95? Its not easy to pinpoint crashes it could be anything, temp of the day, not enough fans .......

Time to go, just one last thing, I wann use my computer not sit around for hrs pannicking about a stress test! My i7920 stressed using prime and aida64 between them 1hrs tops! 4yrs ago now and runs swell thumb.gif

The fact that you don't use programs with 100% CPU load, doesn't mean others don't. There are many people doing folding and similar. Try a video encoding queue for HD material and any instability will show up.

It's not easy to pinpoint crashes, but it's easier if you 're sure it's not your unstable CPU. Saves the hassle of going to fora asking for help and "nothing seems wrong". Or the usual "I can't understand how my Windows installation got corrupted!".

Anyway, it's up to a personal preference. One can live with his PC unstable and when he gets BSOD/corruption, do more troubleshooting before (if ever) find the culprit. Others prefer a stable PC and if they ever get BSOD, at least their know it's not their CPU. It's a matter of taste.

P.S.: I have yet to see a PC that BSODs after passing 10h Blend and 10h largeFFT. The old overclockers had the 24h rule as empirical evidence for 100% confidence stable overclock. From 8h to 10h, the difference is little, but can show an instability. From 30 min to 8h, the difference is abysmal.
Edited by Undervolter - 5/29/14 at 4:09am
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post #32 of 52
Quote:
Originally Posted by ZealotKi11er View Post

I find that just using stuff like Prime and Intel Burn Test is not enough for stability. You have to use games, folding@home, converting videos etc. Basically a stable OC should never crash.

Intel Burn test is much easier to pass. Just yesterday, i passed it at very high, while Prime95 needed 3 more voltage notches up. Prime95, IMHO, IS enough for stability. But you have to leave it to its job for many hours, like the "old school" overclockers were doing. Also, the different Prime tests, do different things:
Quote:
Just remember Prime95 has different test affinities. Depending on what you used could verify stabilty of one portion of the processor or all of it as a whole. Im not a fan of IBT but it has worked for many so I can see it reliable.

On prime95
Small FFT, Test the processor itself and subsystems. With small data that can fit in the L2 cache.
Large FFT, Test the processor and utilizes all cache and some ram.
Blend, Does it all plus fries and a shake.


http://forums.overclockersclub.com/?showtopic=194167


This is why you find reports of people saying that it failed in one and not in the other. Depending on CPU type and cause of instability, Blend for 6 hours may pass, but fail in largeFFT in 2h or the opposite.

I do: 10h Blend, 10h LargeFFT, while looping something with audio playback (i 've found that my AM3+ motherboards show their instability faster, when the audio is working at the same time). Has never failed me.
Edited by Undervolter - 5/29/14 at 4:20am
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post #33 of 52
Thread Starter 
I ran it for 6 1/2 with no issues then i fell asleep the temp was hitting 70c so i turned it off before going to sleep.

normally i get a issue within the first hour
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post #34 of 52
Quote:
Originally Posted by zoneuk View Post

I ran it for 6 1/2 with no issues then i fell asleep the temp was hitting 70c so i turned it off before going to sleep.

normally i get a issue within the first hour


6 1/2 hours isn't bad. You 're probably stable. Unfortunately, there are exceptions:

http://www.overclock.net/t/1489802/i-need-tips-ocing-fx-8320/20#post_22277963


Nowdays, CPUs are stronger, so they can crunch Prime algorithms faster. This is why, i personally condider 10+10h enough (compared to the 24h that old overclockers were suggesting).
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post #35 of 52
I can get a higher CPU Tempature with Prime95.

IBT is a bit inconsistent. Temperature rises, then it lowers, then it goes hotter. Loop.
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post #36 of 52
Thread Starter 
Does this mean i should run it again for 10 hours or so, what temp should i not let it go over ?
to tell you the trueth i was a bit tired so i did not count if it was 5/6/ or 10
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post #37 of 52
Quote:
Originally Posted by zoneuk View Post

Does this mean i should run it again for 10 hours or so, what temp should i not let it go over ?
to tell you the trueth i was a bit tired so i did not count if it was 5/6/ or 10

The unfortunate problem with overclocking already power hungry CPUs, is that exactly, the temperature goes very high. Undervolters like me, don't have any such problem. biggrin.gif

Since you 've passed 6,5h and you hit 70C, if i were you, i 'd stop here. Let's say you can be 90%-95% certain that you 're stable. However, in case you see odd BSODs or something bad with your windows installation, keep that in mind, that it may be some CPU instability.

If you use your PC and don't experience weird issues, forget Prime and enjoy your OC.

Last time i was running an unstable undervolt, i had Win7 turn "wild" after some months. I had been lazy to run 10+10. But after some months, because i put a lot of 100% load and multitasking, i was noticing windows corruption when sfc /verifyonly. Formatting, fresh Windows, same story. I couldn't imagine how it was happening, because i take care of what i install, i don't keep garbage etc. Once i discovered that i was a hair unstable and raised voltage by 1 notch, i resolves the windows corruption recurring problem. That's how things go...
Edited by Undervolter - 5/29/14 at 4:45am
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post #38 of 52
Double post, sorry.
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post #39 of 52
Thread Starter 
Thanks
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post #40 of 52
Quote:
Originally Posted by Undervolter View Post

The fact that you don't use programs with 100% CPU load, doesn't mean others don't. There are many people doing folding and similar. Try a video encoding queue for HD material and any instability will show up.

It's not easy to pinpoint crashes, but it's easier if you 're sure it's not your unstable CPU. Saves the hassle of going to fora asking for help and "nothing seems wrong". Or the usual "I can't understand how my Windows installation got corrupted!".

Anyway, it's up to a personal preference. One can live with his PC unstable and when he gets BSOD/corruption, do more troubleshooting before (if ever) find the culprit. Others prefer a stable PC and if they ever get BSOD, at least their know it's not their CPU. It's a matter of taste.

P.S.: I have yet to see a PC that BSODs after passing 10h Blend and 10h largeFFT. The old overclockers had the 24h rule as empirical evidence for 100% confidence stable overclock. From 8h to 10h, the difference is little, but can show an instability. From 30 min to 8h, the difference is abysmal.

Agree 100% thumb.gif but its not the majority that are doing this for hrs on end. And if it was a work related pc or my life depended on it then OC and fiddling around with other attributes, would be a no no for me!

P.S.: I have yet to see a PC that BSODs after passing 10h Blend and 10h largeFFT. The old overclockers had the 24h rule as empirical evidence for 100% confidence stable overclock. From 8h to 10h, the difference is little, but can show an instability. From 30 min to 8h, the difference is abysmal.

Just curiosity - and what factor or cause is the difference between 24h - 8h - 30mins, heat, glitch in voltage ....?
Edited by ladcrooks - 5/29/14 at 4:56am
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