I have enabled "prefer maximum performance" to troubleshoot some other issues; Upon fresh install of the drivers the card clocks down normally when completely idle, although after some gaming and normal usage, the card is stuck in full 3d clocks ,fan @2k rpm, at all times. this is with drivers 285.38 and also now with 290.36. That's in vista x64 , BTW. Any solution or suggestions? Thanks! BTW, reboot or shut down didn't restore clocking down, only a new driver installation did. Haven't tried rebooting with the new drivers though.