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Need some expert help! - CPU overclock + PSU!

post #1 of 20
Thread Starter 
I posted this in the Intel CPU forum, but more and more I'm thinking its my power supply.

I bought a brand new computer with a used Cooler Master GX 750W PSU. After I built my rig and a week or so later I realized this was a CRAP PSU. It had horrible reviews, bad things have happened with this, guru said this sux and is unstably, blah, blah, etc, etc.

I started to overclock my GPU and CPU. Had a running rig stable with a 12 hour Prime 95 blend at 4.6 GHz and my GPU was stable at 900 core.

All of a sudden lately my computer freezes within 30 seconds on Windows booting at 4.6 GHz. Exact same settings that I had for the 12 hour test.

My computer runs perfectly fine, no freezes or BSOD or anything on STOCK overclocks from my CPU (3.3 GHz). What I am thinking is that the PSU is like dying and not allowing me to use that much voltage anymore for 4.6 GHz. Maybe cant push out the power anymore or something.

Currently I'm running at 4.1 GHz a Prime95 blend test and seems to be working. As soon as I bump it to 4.6 and 1.45 volts I'm freezing.

Is this a PSU problem here or what? I'm not sure what else it could be. Its either my PSU or CPU... It has to be.
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post #2 of 20
The only way to tell is to swap stuff about really, My old psu used to cause freezing like that, it would do it anytime it felt like, idle or load. Mine used to do it at stock too which you're doesnt, so that sort of leads me to think that it could be something else. Have any friends got PSUs that you could borrow?
Edited by andrewmchugh - 10/22/11 at 11:27am
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post #3 of 20
Thread Starter 
Ok this is just really weird....

I'm currently at 4.8 GHz and 1.465 volts and its working... No freezing and running prime95.

I'm just lost for words. Why was I freezing at 4.6 and 1.45 volts!?

I was thinking of just buying a new PSU and seeing if it worked. If it didn't I would just return it.

EDIT: Ok something it wrong. My temps are much lower aswell. I usually don't run at 4.8 cuz temps are high 70's low 80's. I'm currently sitting around mid 60's! How did I drop so much temp? This isnt right its kinda scaring me.
Edited by hahysera - 10/22/11 at 11:34am
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post #4 of 20
Quote:
Originally Posted by hahysera View Post
Ok this is just really weird....

I'm currently at 4.8 GHz and 1.465 volts and its working... No freezing and running prime95.

I'm just lost for words. Why was I freezing at 4.6 and 1.45 volts!?

I was thinking of just buying a new PSU and seeing if it worked. If it didn't I would just return it.

EDIT: Ok something it wrong. My temps are much lower aswell. I usually don't run at 4.8 cuz temps are high 70's low 80's. I'm currently sitting around mid 60's! How did I drop so much temp? This isnt right its kinda scaring me.
It was freezing because the overclock was unstable, it needed a voltage bump, which it received when you did 4.8 Ghz.. and regarding the temps, did you put any actual load on the CPU?

PSUs almost never cause BSODs/freezes/etc, it will shut down your rig completely or restart it 99% of the time.
post #5 of 20
Thread Starter 
Quote:
Originally Posted by Unoriginal Sin View Post
It was freezing because the overclock was unstable, it needed a voltage bump, which it received when you did 4.8 Ghz.. and regarding the temps, did you put any actual load on the CPU?

PSUs almost never cause BSODs/freezes/etc, it will shut down your rig completely or restart it 99% of the time.
I said on the first post that I did 12 hour stability test at 4.6 with 1.45 volts. I've also had those settings from the start. Ive used those settings like in BF3 and SC2 no problems at all. So it wasn't unstable.

I'm currently back to 4.6 and 1.45 volts and its working again. I have no clue man. I dont understand whats going on. It works, then freezes constantly, then works again.
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Noob Tube
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post #6 of 20
Quote:
Originally Posted by hahysera View Post
I said on the first post that I did 12 hour stability test at 4.6 with 1.45 volts. I've also had those settings from the start. Ive used those settings like in BF3 and SC2 no problems at all. So it wasn't unstable.

I'm currently back to 4.6 and 1.45 volts and its working again. I have no clue man. I dont understand whats going on. It works, then freezes constantly, then works again.
>90% of SandyB K samples are doing 4.5Ghz and more with <1.35v, yours needs 1.45v or more to do the same, tell me, did you buy this new or repackaged or from a private seller?
post #7 of 20
Thread Starter 
Quote:
Originally Posted by Unoriginal Sin View Post
>90% of SandyB K samples are doing 4.5Ghz and more with <1.35v, yours needs 1.45v or more to do the same, tell me, did you buy this new or repackaged or from a private seller?
I've been wodering that from the start. I was told I just have a voltage hungry chip. I bought it brand new from Newegg. I keep getting BSOD 124 if I try to lower my voltage.
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post #8 of 20
Not your PSU, just unstable overclock. The PSU is crap, but of a sort that will cause cumulative damage, not random freezes or anything like that. The PSU may over time cause your CPU to require higher voltage, but will not itself directly cause instability until you go north of 550W (which you aren't).
post #9 of 20
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
Not your PSU, just unstable overclock. The PSU is crap, but of a sort that will cause cumulative damage, not random freezes or anything like that. The PSU may over time cause your CPU to require higher voltage, but will not itself directly cause instability until you go north of 550W (which you aren't).
Alright can I get an explination then of an unstable overclock? Do I need more then 12 hours Prime95, 40ish hours of BF3, 20ish hours of SC2, many 3Dmark benchmarks... What else do I need to do to confirm "stability".

If it were unstable, why would it freeze so quickly. I know that if I lower my voltage too much it will crash while windows is loading, if I raise it a bit, it will crash on the welcome screen, if I raise it a bit it will crash during the first hour of Prime95, if I raise it a bit it will crash during the first 5 hours of Prime95... See what I mean. It seems the higher then voltage, the more stable I'm becoming. So how all of a sudden I freeze instantly about 4 times during Windows loadup?

It seems like something deeper, more complicated, more serious then just a "unstable overclock".

Currently Im at about 45 mins on the exact same overclock. 4.6 @ 1.45 volts.

EDIT: I've never "froze" I don't think. I've always got BSOD 124.
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Noob Tube
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post #10 of 20
Quote:
Originally Posted by hahysera View Post
I've been wodering that from the start. I was told I just have a voltage hungry chip. I bought it brand new from Newegg. I keep getting BSOD 124 if I try to lower my voltage.
Most likely a repackaged sample.
Return it if it comes with little or no cost at all, or just kill it and apply for standard RMA, if you don't know how to do it I'll help you.

What motherboard do you have and what are your other CPU voltage/llc/etc settings?(post a pic if you can)
Quote:
Alright can I get an explination then of an unstable overclock? Do I need more then 12 hours Prime95, 40ish hours of BF3, 20ish hours of SC2, many 3Dmark benchmarks... What else do I need to do to confirm "stability".
SandyB CPUs use very poor quality silicon, this means they degrade very fast, this in turn means that after someone pushes them to extremes(1.6v or more for w/e 'home binning' reasons;p) they display this exact behavior, requiring higher voltages to achieve the same stable clocks that were previously doable with far lower voltages. The CPU is essentially dying, it will require higher voltages with each stress test you throw at it.. you can return it as it is if they'll have it back or just put it out of its misery yourself.
Edited by Original Sin - 10/22/11 at 1:26pm
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