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Hard to determine if my GTX 670 Overclock is stable

post #1 of 5
Thread Starter 
I have never tried overclocking a 3D Card before.

Originally I had a single Evga GTX 670 FTW in my system (along with a GTX 650 for PhysX), and using EVGA's PrecisionX tool I was able to overclock it to +85Mhz on the GPU and +500Mhz on the Memory.

The only thing that would show me any artifacts if I pushed it above those settings was Heaven Benchmark, where I would occasionally see a star-shaped flash of light sometimes... rarely.

Eventually I got a second 670 of the exact same model and first replaced my old 670 with it to test how well that could be overclocked. Everything except Heaven showed artifacts so I lowered it until I got to +70 on the GPU and +400 on the Memory.

I threw everything I had at it, EVGA's testing tool, Furmark, 3D Mark, OCCT, Catzilla, and I didn't see any artifact. I assumed I saw a single artifact after running Heaven for about half an hour, but I couldn't tell because it happened out of the corner of my eye.

Worried about Heaven, I googled about it and some people mentioned occasional glitches even with no overclock, so I assumed it wasn't an actual artifact due to overclocking and carried on.

However a few days later, when I found out about the Final Fantasy XIV benchmark I was curious to try it out, well, the benchmark itself ran fine, but while I was messing with the character creator I saw a few artifacts in the terms of polygons stretching into a square for about a microsecond.

I threw even more tests at it, and all of them recorded zero artifacts.

At this point, I am not sure how to test it. First of all, is it possible to run one card at a time since it would be a pain to undo the SLI at this point? And if so, is there any better (preferably automated) way other than running something like Heaven in a loop for an hour while darting my eyes all over the screen in hopes I will catch something, because that WILL cause quite a lot of pain to my eyes? Can I even be sure what I saw in Heaven and the FF14 benchmark were the fault of the overclock or something else? The FF14 benchmark set at maximum wasn't even straining my system as I got an average of around 174FPS or so, so I find it weird that this could show artifacting while games like Metro2033 that still dropped to 40FPS at times did not.

I also ran every GPU-heavy game to test the SLI at maxed out settings like Crysis, Metro2033, Sleeping Dogs, etc and saw no issues (Admittedly, I only played those for a few minutes each). The only things I saw issues in were (possibly) Heaven and the FF14 benchmark. Is there any automated tool that can verify for me? If it really was artifact in FF14 and I noticed it several times within half an hour or so, then surely an automated tool should notice it after hours of testing shouldn't it? Or are automated attempts to detect artifacts useless?

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post #2 of 5
Try OCCT and turn on error checking. That should make stability a little more black and white.
post #3 of 5
Thread Starter 
I ran OCCT with error checking for an hour, as well as Evga's testing tool on several tests for an hour each too, none showed any errors, but I am not sure how automated testing tools are since I have seen artifacts back when I was using a single card on Heaven, sadly heaven has no error-checking and I can't just sit on front of a screen with a looping animation for an hour hoping I won't miss any possible micro-second artifacts.
post #4 of 5
Artifacts often mean too high memory overclock.

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post #5 of 5
Thread Starter 
Is there any good way to determine if I am really seeing artifacts or if its the application itself that's glitching?
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