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post #11 of 25
Thread Starter 
Guys I used prime95 with small FFT for 1/2 am hour and it looks good then I used (Blend) for like 5-6 hours I went to sleep then when I woke up I saw my computer on log in screen and it has crashed so not exactly sure after how much it crashed
what to change next for a stable system ??
Know that the room my computer was was with no air condition is it right to evaluate a computer like that with strees programs ? or should I turn on the air condition ?
post #12 of 25
Stress testing should occur in a worst-case operating environment, so do it with the A/C off.

It sounds like you're really close to 3.8 GHz stable; try bumping up the Vcore one more notch. You're still well within safe voltage/temperature limits.
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post #13 of 25
Run Small FFTs first for ~8 hours. That's going to focus on the cpu. After it gets stable enough to pass that you run BLEND. If you fail Small FFTs you know the cpu oc is unstable. If you fail blend you know it's the NB or RAM.

One thing at a time.

You should do it while you are near the pc to make sure the temps aren't getting away from you.

Here's a few things I forgot to mention last night, forgot, sorry.

1) Turn OFF all throttling options in your BIOS such as C1, EIST and such.

Should look like this:
Quote:
Advanced Bios Features:

Limit CPUID: disabled
No-Execute: disabled
C1E: disabled
C2/C2E: disabled
CPU Thermal Monitor: disabled
CPU EIST: disabled
Virtualization: Enabled (this can be disabled safely)
Initial display: PEG

If you are running a graphics card, this should be set like this: Initial display: PEG this means your BIOS will skip the step of initializing onboard graphics and go straight to the card.

2) You may need to bump your vcore up a bit because I notice your BIOS doesn't have Load Line Calibration as an option for the cpu voltages. This means your cpu may need a touch more vcore than other 9550's because you'll get vdroop when it's under load.


So bump your vcore up to 1.34/1.35 or there abouts and try Small FFTs again for ~8 hours watching the temps--only bump the vcore nothing else. You want to stay under 70c. The fact that you are so close to 3.8 at that vcore with no LLC shows that chip has some good potential but, I still say you should invest in a tower cooler. I'd bet a dollar you'll get 4GHz with about 1.4 vcore with a good cooler.

Hyper 212+ 30 bucks with free shipping. I'm positive that's all you need to get that chip as far as it'll go.
Edited by crashdummy35 - 6/21/12 at 10:59am
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post #14 of 25
Thread Starter 
Thanks for the advice crashdummy35 I'll consider buying Hyper212+ soon
the only time when i stay away from my PC like 6-8 hours is when i sleep but I'll try to find something useful for long 6-8 hours !
I'll post ASAP
post #15 of 25
I really dont see point in 12 hours of prime95 you are just wasting your chip, IBT is way faster, 10-20 loop of IBT will almost always guarantee normal operation.
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post #16 of 25
Quote:
Originally Posted by sena View Post

I really dont see point in 12 hours of prime95 you are just wasting your chip, IBT is way faster, 10-20 loop of IBT will almost always guarantee normal operation.
If you're borderline stable a lot if times you can pass IBT just fine, but Prime will throw an error.

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post #17 of 25
Quote:
Originally Posted by clark_b View Post

If you're borderline stable a lot if times you can pass IBT just fine, but Prime will throw an error.
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Now watch this, i had i7 920, which i never tested in prime95, and CPU worked on 4.1 GHz for half year, i played dozens of game, benched, decoded and compressed lot of stuff stuff on him without any error.
Prime95 is just theory test, you can pass both prime and IBT and crash in browser or some old game.
IMHO 2 hours of blend is enough for everyday, after all let author decide, with 12 hours he is putting chips to a risk.
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post #18 of 25
Quote:
Originally Posted by sena View Post

I really dont see point in 12 hours of prime95 you are just wasting your chip, IBT is way faster, 10-20 loop of IBT will almost always guarantee normal operation.

IBT is good. I've used it previously. But two issues I've dealt with first hand:

1) IBT runs hot as hell. Nothing on Earth is going to run your cpu like IBT does. When cooling is an issue, IBT can give problems if the temps get too high because, the heat can cause instability and someone can mistake it for hardware limitations. P95 will usually "top out" after ~45 minutes or so--after that you get the general idea of the max temps running it. I've seen my temps (on my old cpu) run a whopping 15c cooler using P95 instead of IBT.

2) And as clark_b correctly stated: I have passed IBT on more than one occassion only to later find my rig was unstable. I've corrupted an entire Windows install more than once cutting corners stress testing. That's for real. 2 times my rig just got weird boot issues after a month or two because she was unstable. Small FFTs for cpu, then Blend for NB/RAM have never once failed me.

Gaming or running P95 for a few hours, what's the difference? It's not "wasting" the cpu...it's running it hard the way it would be running using some things like: BF3, Origin, TeamSpeak 3 and a media player all at once for hours on end the way I do everyday almost.

People on this forum will tell you: I am the last guy to have someone do something I wouldn't do myself. Hardware costs money, brother. I understand that completely. thumb.gif

But overclocking 775 gear is a step-by-step process. And, put simply: short cuts don't pay.
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post #19 of 25
Quote:
Originally Posted by crashdummy35 View Post

IBT is good. I've used it previously. But two issues I've dealt with first hand:
1) IBT runs hot as hell. Nothing on Earth is going to run your cpu like IBT does. When cooling is an issue, IBT can give problems if the temps get too high because, the heat can cause instability and someone can mistake it for hardware limitations. P95 will usually "top out" after ~45 minutes or so--after that you get the general idea of the max temps running it. I've seen my temps (on my old cpu) run a whopping 15c cooler using P95 instead of IBT.
2) And as clark_b correctly stated: I have passed IBT on more than one occassion only to later find my rig was unstable. I've corrupted an entire Windows install more than once cutting corners stress testing. That's for real. 2 times my rig just got weird boot issues after a month or two because she was unstable. Small FFTs for cpu, then Blend for NB/RAM have never once failed me.
Gaming or running P95 for a few hours, what's the difference? It's not "wasting" the cpu...it's running it hard the way it would be running using some things like: BF3, Origin, TeamSpeak 3 and a media player all at once for hours on end the way I do everyday almost.
People on this forum will tell you: I am the last guy to have someone do something I wouldn't do myself. Hardware costs money, brother. I understand that completely. thumb.gif
But overclocking 775 gear is a step-by-step process. And, put simply: short cuts don't pay.
I understand all that, but bear in mind that prime95 degraded my i7 970 (750USD CPU), and everything was normal, voltage 1.35V, and temps about 80C (which are normal for that chip), altrough i am still not 100% sure that prime95 degraded.
Edited by sena - 6/23/12 at 5:37am
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post #20 of 25
Quote:
Originally Posted by sena View Post

I understand all that, but bear in mind that prime95 degraded my i7 970 (750USD CPU), and everything was normal, voltage 1.35V, and temps about 80C (which are normal for that chip), altrough i am still not 100% sure that prime95 degraded.
As long as he isn't going much over 65C in Prime with his Q9550 he shouldn't really worry if his vcore is at or below 1.34V-ish. Like crashdummy said, Prime isn't much more stressful than gaming. IBT on the other hand...
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