I did search in google and a lot of review said 2.66 wins. But http://www.macrumors.com/2009/03/14/updated-mac-pro-benchmarks-and-video-of-internals/ show me 2.8 is better. They are same price in reimbursed store now so which on I should pick? My usage: iTune, iPhoto for relax. Programming in Vision technology, Parallel Algorithm and iPhone programming. Thanks. BTW: The 2.8 come with 2600 video card, 2G mem and 320 HD the 2.6 come with GT120, 3G mem and 640HD. I am not really care about HD but will 3G and 2G will be big difference?