My brother has just purchased a macbook pro 13". He is mainly going to use this for school, research, and everything else macs are normally used for. However, he has asked me to use bootcamp so he can be able to also play some games on it. Upon looking at its specs, it looks like its able to play a lot of the games he plays with 4GB DDR3, 2.4GHz p8600, Nvidia 320m. However, what operating system should I advise him to get for gaming? Since it isn't a gaming machine, all the fps will matter. So will I get better FPS on XP or 7? (and 32 bit/64?)