I have a 8800 GT, and the game performs well on high settings, no AA, 16X AF, 1280x960 screen resolution. I get consistent framerate, the game is fully playable, although in great part is thanks to the rest of my PC, a I7 2600k processor @3.4ghz and 8gb of RAM at 1600mhz offsets the somewhat outdated GPU (I had it from my previous PC)