Re: 6800 GT whips X800XT in Quake 4!!
The Doom3 engine was not "written" for nV cards. It simply just uses an OpenGL renderer. Carmack doesn't prefer nV cards, as a matter of fact his primary dev machine is an XB360 with an ATi chip!
ATi just needs to get on the ball with their OpenGL performance, lucky for them OpenGL is limited to only a few games and some retarded screensavers.