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how to go about over clocking and test stability??

post #1 of 19
Thread Starter 
hey im looking into OC'en my 580 but im only use to ATI cards so im not sure how to get the best OC i can and how to test stability. right now i got MSI Afterburner and kombuster so far Afterburner seems straight forward except how to adjust voltages even though im not going to right now i just wanna know how to use it, but im not sure the best way to test stability on my GPU.

could i use OCCT GPU to test for an hour? if that passes would it be stable?
    
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post #2 of 19
Kombuster will not give you any indications on how 'stable' your OC is.

I use OCCT for all my GPU OC testing.

http://www.ocbase.com/perestroika_en/index.php?Download

Since I fold, I need my clocks solid... An hour might be seen as overkill... Id go 15min to 30 min.

Make sure its in error check mode though.
Edited by Sethy666 - 6/5/11 at 11:07pm
post #3 of 19
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so i want 0 errors at all times?
    
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post #4 of 19
OCCT is good but I've had cases where the GPU passes OCCT w/ 0 errors but crashes in games. I usually use OCCT as a quick test while adjusting the clocks and then loop 3DMark 06/Vantage/11 and Heaven a few times each to be sure. Vantage (and DX10 games) seem to be the most sensitive to unstable OCs, at least for fermi cards.
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post #5 of 19
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but having 0 errors is ideal right? so if im getting them i should lower my core clock right? also does upping my mem clock help to stable my core clock or is that having to deal with my core voltage?
    
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post #6 of 19
Quote:
Originally Posted by Evil-Jester View Post
but having 0 errors is ideal right? so if im getting them i should lower my core clock right?
Yep, definitely
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post #7 of 19
Quote:
Originally Posted by Evil-Jester View Post
but having 0 errors is ideal right? so if im getting them i should lower my core clock right?
I aim for 0 errors. If I get errors, I lower my clock / volts

Some say less than 5 but I have found with folding that zero is best. Even with 2 or 4 errors, my folding client gives an unstable machine error.

Ive never had a game crash due to GPU errors. CPU maybe , ram definitely but never GPU.

Dont worry about mem clocks just yet. Get your core and shaders first, then mem.
post #8 of 19
Thread Starter 
so make stable core then shader then mem? and should io just leave my shader set to auto when it slides with my core clock or should i turn that off then one at a time?? also if i do my mem clock first will that have any affect trying to stable my Core or it does not make any difference???
    
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post #9 of 19
OCCT does nothing for my EVGA 580. Passes 1 hour without errors with unstable overclocks and still crashes in games. Weirdly enough, my 570 worked great with OCCT and picked up errors just fine. Furmark doesn't seem to work on my 580 either. The only program that actually works is ATITool/GPUTool. Using this, I can find errors in about 20 mins or so. Best to leave it on for an hour though. Using GPUTool and Crysis Benchmark 99 loops you can find errors and crashes rather quickly.
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post #10 of 19
Quote:
Originally Posted by Evil-Jester View Post
so make stable core then shader then mem? and should io just leave my shader set to auto when it slides with my core clock or should i turn that off then one at a time?? also if i do my mem clock first will that have any affect trying to stable my Core or it does not make any difference???
You can start anywhere you want, I ideally start with the core first then work my way to the memory. Core and Shader is linked by the way. You want to goto Afterburner settings and unlock voltage control to change your voltage.
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