I just built a new system with a 7800GTX 256 card...I have my desktop resolution set to 1280 x 960 @ 85 hz...how do I lock this 85 hz so that when I play games that my refresh rate will not drop to 60 hz in XP...with my old ATI card there was an option in the video card properties to make your refresh rate "same as desktop" when gaming...is there a similar option with Nvidia cards??