I have a iMac 24inch early 09 so I installed boot camp with vista ultimate right and some games..... boot camp: Halo PC Battlefield 2142 Mac: Halo mac Age of empire 3 All these games work extremely well, and believe it or not there is absolutely no lag when I record the games with ishowu! I do like to examine PC's and then compare then to Mac's graphics to see what differences there are just for the sake of it. But anyway a good amount of ram will defiantly help out with your graphics processor. I pushed halo and AOE to the maximum, by commanding as many troops as I could or versing a lot of aliens and firing non-stop. There was a slight 0.02 of a second lag from AOE when moving the map around with a lot of troops moving at the one time. Halo was mostly good but once you melee'd the aliens the blood used a lot of the graphic processor and slightly slowed down untill you looked away from it. I give mac for games a big 9/10 for gaming!