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Prime 95... tricking with my PC?

post #1 of 16
Thread Starter 
Hello, I am new for overclocking, so maybe this question will be a bit trivial. Still I will appreciate your help very much...

I´ve OC my Sandy bridge 2500K to 4.5 MHz. I ran Intel burn test 20x on voltage 1.305 and system was stable. Then I was told to stress my CPU harder by using Prime95, so I did.
On 1.305 my PC crashed in 5 sec! :-) So I start rising voltage. When I was on 1.345, my PC was stable for almost 8 hours (on max CPU temp. 68°C). So I decided to rise voltage again to 1.35, but...!
My PC crashed in 3 hours!!!

Now I am a bit confused :-( What´s wrong? I thought, that rising of voltage will support stability, no reduce it :-( Would you please tell me, what´s wrong, and what to do now? Should I decrease voltage again? Or was it just some "mistake" and I shall run test again on 1.35 or maybe on higher voltage?

Thank you very much!!


PS: I didn´t set any options on Prime 95. I just choose "Torture test" and run "Blend". Did I do everything right?
No extra RAM was stressed. Just basic (I´ve got 8GB total).
post #2 of 16
Increasing the voltage produced more heat. 70C is considered crash and burn temp. Going past 68C could easily cause a crash. I say, back off the voltage to 1.34, and maybe ease off the overclock if you value stability. 68C is REALLY hot. Or get much better cooling (Hyper 212+ would be great).
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post #3 of 16
I hope you have an aftermarket cooler.
    
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post #4 of 16
8 hours prime stable is pretty good. I would consider that stable enough for everday use, since nothing else you do will ever come close to stressing the chip that much, for that long.

Try small ffts's next time at that speed and voltage and see how far you get, if it is <1 hour then I would back off on speed and volts. If your chip goes over 70-75C I would stop, and back off your oc, until you get a better cooler.

EDIT: You could try disabling HyperThreading to give you lower temps, and thus more stability.
Edited by techheadtrevor - 2/2/11 at 5:03pm
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post #5 of 16
Thread Starter 
Thank you very much! :-) I use Noctua NH-D14, still I use resistors. So I put them of and let Noctua do its best job. I will reduce voltage again too and will start again to see, what happens :-) Have a cool time mates :-)

PS: I see, that temperature over 70°C may cause unstability. But I´ve heard, that only temperature over 80°C may cause harm to CPU. Is it correct? I don´t think, that slightly over 70°C may harm CPU. What do you think?
post #6 of 16
Quote:
Originally Posted by techheadtrevor View Post
8 hours prime stable is pretty good. I would consider that stable enough for everday use, since nothing else you do will ever come close to stressing the chip that much, for that long.

Try small ffts's next time at that speed and voltage and see how far you get, if it is <1 hour then I would back off on speed and volts. If your chip goes over 70-75C I would stop, and back off your oc, until you get a better cooler.

EDIT: You could try disabling HyperThreading to give you lower temps, and thus more stability.
Hey Trevor he has a 2500K not a 2600K it's an i5, no HT to disable that is Default.
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post #7 of 16
Quote:
Originally Posted by tomr View Post
Thank you very much! :-) I use Noctua NH-D14, still I use resistors. So I put them of and let Noctua do its best job. I will reduce voltage again too and will start again to see, what happens :-) Have a cool time mates :-)

PS: I see, that temperature over 70°C may cause unstability. But I´ve heard, that only temperature over 80°C may cause harm to CPU. Is it correct? I don´t think, that slightly over 70°C may harm CPU. What do you think?
Now your talking.
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post #8 of 16
Thread Starter 
I am sorry, but I didn´t understand your response Doom :-( Well, what do you think about temperatures and unstability/harming CPU mates?
Is it right, that over 70°C - 80°C may cause instability, but no harm, and over 80°C may cause harming of CPU?
Thank you for possible advice!

PS: you see, I ran my PC on 69°C-70°C for whole day, so I hope, my CPU is in 100% healthy condition after my "stressing treatment" :-)
post #9 of 16
Most CPU's/boards have a thermal threshold. Once breached they will automatically BSOD or shut off system. I wouldn't worry about it. I'd say on air the safe voltage (for AMD systems anyways) is 1.55v. The settings should be somewhere in your BIOS and iirc are changeable.
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post #10 of 16
"Safe Temps" for the i5 and i7 series is generally 70-80*C. The cooler, the better. Like already stated, things will ALWAYS BSOD or hard shut off before any sort of damage will ever occur if you're within safe voltages.

"Safe Voltages" for the SB chips SEEMS to be 1.45v or less. I've seen crazies put 1.50v+ through their SB chips though, so they may take more than "safe" easy enough.

So you're completely safe all the way around.

When you open Prime95, hit "Blend", but then immediately after, hit "Custom" and set at LEAST 6144MB of RAM usage since you have 8GB (3/4 of your RAM should be stressed). If you can pass at least 10 hours (that's how long it takes to run all the tests from Prime) at those settings, you're solid .

Prime will stress more of your RAM than IBT generally will, if you used the Standard IBT test. So your instabilities COULD be memory related. Especially since it appears to be a random error. I'd check into your RAM first.
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