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OC stability: what is good enough?

post #1 of 5
Thread Starter 
I'm new to the realm of graphics card OC, and with my new gtx 560 Twin Frozer II I've got a great testbed to learn a lot. Here's where I'm at with my stable OC of this card using stock voltage (1.000v) with these tools:

Furmark (ala msi kombuster): 975Mhz
Unigen Heaven loop: 950Mhz
3Dmark11 test2 loop @performance level: 925Mhz

Depending on which games I play (dx9, dx10), I can run 950Mhz with no apparent problems (at least not yet). Does this mean I have a stable OC at 950? Should I worry that I'm screwing up my card using this OC since it will fail a tougher test?

Also by bumping up the voltage, the above OCs reach 1000, 975, 950 respectively, though up beyond 960 the 3Dmark11 loop produces slight and occasional artifacts. Should I consider that I've hit my upper limit? Or is this only a cooling and/or voltage issue? The hottest I've seen this card hit is 70c.

Thanks for reading.
Edited by *AcidBath* - 2/14/11 at 12:14pm
post #2 of 5
Max temp at 70C shouldn't be a cooling problem. At stock volts or with a slight overvolt you should be fine at those clocks.

Basically stable is what you want it to mean. If you game and your games don't crash then that's effectively stable.

Folding would probably be the hardest test of a GPU but if that's not your usage then it doesn't matter if your OC isn't folding stable.
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post #3 of 5
The most effective way to test your overclock is to run Crysis benchmark and pass 30-50 loop at max settings. Furmark, MSI Kombuster, and other benchmarks are only good for testing max temperature. A lot of people have tested those benchmark for hours and still crash in normal game play in the matter of minutes.

If your getting artifact, then you need to up your voltage to compensate for the increase speed or lower your memory. Also, make sure your GPU is capable of handling the increase voltage. Your temperature might seem low but if the voltage is too much for the card it will degrade and possibly damage in the near future, so do your research.
Edited by DaRookie - 2/14/11 at 1:07pm
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post #4 of 5
Thread Starter 
From your replies it seems there is no real standard for GPU OC stablity. I guess it comes down to 'are you happy with your performance'.

When someone comes along with some stated GPU OC, it'd be nice if there was some standard for stability that was well accepted and meaningful; though very popular, furmark based tests are completely misleading IMO. I've also found that the freebie 3Dmark11 tests run way too short to test stablity and even Heaven is 'forgiving'. My torture test is to run 3Dmark11 test 2 in loop mode; everything else that I've tried for an OC will show I'm stable while it'll fail this loop in a few minutes.
post #5 of 5
it's good Mhz~the gigabyte GTX 560 Ti SOC default 1000Mhz core speed ^^
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