I noticed my fan running slow on my 8800 GTS (G92) card and it getting insanely hot when running (it's clocked at 730 by default). So, I installed Rivatuner to adjust the fan speed. I have used Rivatuner before but when I tried to access the settings, they weren't available.
So, a little bit of Google-ing led me to this find out that RivaTuner doesn't recognize the new 8800 GTS (G92)

as of the current version 2.06, Howeverm if you go to RivaTuner.cfg, open it with a text editor, find the line reads:
change this to (append ",600h"):
Everything should work from there. Make sure you have permission to alter the file first.