I have a Mac Pro, bought in Jan 09, pretty standard, added extra superdrive, 500 gb hard drive, and the Nvidia Video Card option as I prefer it over ATI. I want to use it for games and I have installed Bootcamp and windows, Played Halflife 2 on it recently, loved the grapichs and it ran sweet. As far as I can tell its just as good as my father in laws PC he built for gaming hardware wise and as I understand it when it is in bootcamp it is PC so I figure that its a pretty decent gaming machine for that reason. Please correct me if I am wrong, I am by no means an expert. What I am wondering is I plan to play Call of Duty: World at war next and other games as they come out, and some games like Call of duty are available to run in mac or windows... In these situations, is there any reason why I should buy one over the other, will my machine run better in OSX for those games or Windows XP?