hi Herbumus, sounds pretty capable. I have a Windoze vista 64 'handicapped' Core i7 with 6gig ram and gtx 275 1 gig graphics. I run max all settings most of the time, but in the more detailed sceneries, I might have to reduce ai traffic and objects, but only a little. My latest xbone video was done @ full settings, including treehugger setting if u can upgrade your graphics card that would be good. Check out Toms hardware benchmark graphs of vid card performance. The 4850 is about 35% slower, but maybe your slick mac os will make up for things! Maybe another mac owner can confirm satisfaction. I easily get 30-60fps, I'm happy. For xp10 I may upgrade to windoze 7 and a beefier graphics card. I think that's the advantage of pcs, being able to swap cards easily. Have fun shopping, wow 27 incher..