[citation][nom]apache_lives[/nom]power saving that *works* ???[/citation]
I'm not sure if this is doable on Nvidia cards, but for my 4870 I use ATI Tray Tools in an awesome way. I use the 'auto overclock' feature with two profiles. I have my 'desktop' profile which is undervolted and heavily underclocked, I believe something like 350/400. Combined with the undervolt it eats much less juice (according to GPU-Z). It auto detects when I open a game and switches to my 'OC' profile, plays a little chime, and when I exit it goes back to 'desktop' and plays a little chime. Also you can add specific programs to be excluded that don't need it, like Diablo 2 or any older game.