Coolbits and RivaTuner too don't allow me to set the clockspeed over 580/1110mhz. How i saw, this is not the maximum for a nx6600gt. It can't even be the cooling, I've a Thermalright v-1 Ultra with 2 80mm cooler with good temps. What could be the problem?
If I tray to set the speed up, RivaTuner gives me the following message while testing the setup: "The driver failed to pass internal test with the clock frequencies you are about to set. Please decrease clock fequencies and try again."
But if i set 579mhz, it even works not too, with same message!
Use ATi Tool .25 Beta. There's no built in test, just push it until you get artifacts. Once you've found a good speed, go into Coolbits and have it set to apply at startup.
I just installed the beta-driver 83.90 but it doesn't help.
And if I put the clock-speed with the ATI-Tool over 571 I'll only get some currios colorful patterns on the screen. Thats a bit crazy.
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