Right click this link
tell it to save as and put it into the crysis/game/config folder. (or warhead/game/config... either one works)
The game will load up my custom graphics config file which is basically a tweaked ultra config. It should run really well on your setup. I wrote it originally for my OC'd GTX 275 then tweaked it a bit for my GTX 470. Now that I've got 2 of em, I probably should go back and bump up the draw distance for some stuff but I'm too lazy and would rather run 4x sparse grid anti ailiasing instead via nvidia inspector.