This is what I'm working on at the moment. I've already posted results for the Radeon HD 5870 in the 6-core Westmere. I've now got a Radeon HD 5770 the same Mac Pro running my gamut of games. Here's a teaser while I'm working. World of Warcraft at 2560x1600 Ultra with 4x Multisampling. 5870 = 110 fps 5770 = 61 fps (5870 is 80.3% faster) At 1920x1200 Ultra with 4x Multisampling. 5870 = 140 fps 5770 = 85 fps (5870 is 64.7% faster) Is it worth paying 80% more to go 80% faster? Duh.