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Trying to verify if PSU is culprit...

post #1 of 8
Thread Starter 
Been testing for stability with overclocking my new video cards but I can't tell if my power supply is holding me back or I'm just unstable in general. So far the results have been...

-3DMark11 feezing in middle of benchmark
-3DMark11 minimized back to desktop with 'Display Driver Stopped Responding...'
-3DMark11 freeze into black screen
-3DMark11 freeze into black screen followed by computer restart

In the end I found a wall where no matter how far I pushed the voltage on the video cards that I always end up with the same result '3DMark11 freeze into black screen followed by computer restart' which leads me to think that it's my power supply holding me back since I'm already pulling 1150-1250watt from the wall (maybe more since Kill-A-Watt meter isn't always accurate). Anybody have a take on the situation?

This is a first for me since the only other power supply problem I ran into was an old Thermaltake ToughPower 750watt that would shut down on me on load where the cause seemed to be from overloading the rail(s).
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post #2 of 8
I can assure you that if you're talking about your sig rig, that your PSU isn't holding you back Most likely one of your GPU's doesn't like overclocking for some reason. I had a similar setup (i7 2600k, tri-sli 580's clocked @ 900mhz on the core) with an HX1000 and it wasn't stressing the PSU (you're pulling maybe ~ 800W).

If you run another stress tester, does it freeze? I.e. if you run Heaven 2.1 with everything maxed out, does it freeze or have glitches? In games does it freeze? If you run 3DMark11 with everything at stock settings do you get errors?
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post #3 of 8
what are your temps looking like on those cards?
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post #4 of 8
Thread Starter 
Haven't tried any benchmark besides 3DMark11 Advance since it comes free with the cards. Maximum temperature I'm seeing is about 81C on the top card using the preset 'Performance' test on a constant loop. Everything runs normal when the cards are on stock overclocked settings. I'll go download the Heaven Benchmark if I get any similar results. Just don't let the power of my computer fool you cause there are in fact six 4amp/48watt fans running along with it...so I'd say it will still sit around ~950watts on complete load.

Otherwise I'm still messing around to see if I find any changes with using different overclocking settings.
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post #5 of 8
Sounds like a bad driver or too much of an overclock? Or are they stock?
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post #6 of 8
Thread Starter 
Yea I'm thinking I just hit the brick wall on overclocking...

940MHz seems to run fine on a constant loop yet either 950MHz or 955MHz I'm getting all kinds of weird errors no matter how high the voltage I bump it up to. Sadly this is only for 3DMark11 so it'll probably change for any other applications I run...just need to test even further.
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post #7 of 8
Quote:
Originally Posted by pvp309rcp View Post
Yea I'm thinking I just hit the brick wall on overclocking...

940MHz seems to run fine on a constant loop yet either 950MHz or 955MHz I'm getting all kinds of weird errors no matter how high the voltage I bump it up to. Sadly this is only for 3DMark11 so it'll probably change for any other applications I run...just need to test even further.
I think you are right. I was overclocking an old 9800 GTX+ and once I got to an overclock so high it was artifacting, I bumped it down 10MHz and whenever benching got the same problems you were getting. After lowering another 15MHz it was fine. Unfortunately lowering it 25MHz means I got a terrible overclock on it haha
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post #8 of 8
Thread Starter 
Even 900MHz is giving me some issues. Honestly...I think I give up on overclocking video cards. All the way back to a 8800GT SLI setup and towards a GTX275 SLI setup...I was never able to get any decent overclock out of any of them. Seems like deja vu all over again.

It was always about checking for artifacts...and then testing on several different benchmarks for stability. However, there's always going to be a hiccup on a random game(s) where it would crash because of your overclock...causing you to pull back to the point where overclocking seems pointless.

Ugh...I'll get over it. Thanks for trying to help guys.
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