Really? Even the final scene? My 24" monitor came in when I was halfway through the game, so I finished it on 1920x1200, but at 1920x1200, all very high, no AA, my 4870x2 pulled about 30-35fps through most of the game, but in the final scenes, it dropped all the way down to 10-12fps in a couple spots (just in the cutscenes though - not in the gameplay).
Oh, and agreed about the fast CPU. I have a 3.73 GHz i7.