Or EVGA Precision. There are many good threads about OCing the GPU but here's the gist of it.
Open Precision and unlink the Core from the Shader. Then OC your Memory slightly and test for stability. I recommend running Crysis as that game will pick up most instabilities by crashing. Repeat OCing the Memory until you run into artifacts or crashes. Then you work on your Core and Shader. Just OC both a little at a time, Core first then Shader. Test and repeat. It's time consuming but it'll be worth it to find the best game stable clocks.
Hmmm i have this same problem =[ i tried riva tuner, didnt work, then tried evga precisionand it worked, but as corvette said, mine does the same, you click apply then it reverts back to the original. But in my case i though...hmm, wonder if it will underclock, tried it, it worked but now i cant get it back to defaults for some reason =[
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