I've been searching a lot of threads trying to find optimal settings for COD4 Mac. I've got a mac pro 2.8ghz dual quad core (8 total), 10gigs of RAM, 8800 512mb card and I've yet to find killer settings. I think I have it on 1200x960 or close to that with AA on 2x and get about 30fps. I'd sacrifice quality for speed, but haven't found a good compromise yet. ANybody have luck?