Ok so today I went over to my friends house who has a 2007 20" imac with 4 gigs of ram, 2600HD pro, 2.4ghz C2D. he was running cod 4 with textures on High, and res set at what ever is native res for a 20inch imac, (it escapes me right now) Any way. I went home and played cod 4 on my 2008 mac pro, 4 gigs for ram, 2.8ghz octo, 2x2600 ati graphic cards same res as him. (my 30ACD is too high to run well so I turn it down the the 20 inch res) and for some reason I get far less Frames per second then him with all the same settings. And his computer is 1 year older then mine, and his hard drive is 90% full. How is he possibly getting better FPS then me? My mac pro (on paper) is way faster then his imac. Anyone no any tweeks to make the game use more of my cpu?