I have bought a mac pro because is highly configurable. Now i going to sell it. this a 2006 macpro EFI32, there is no graphic cards the expansion is too limited for a machine that have cost $2000. with that price i have bought a pc and today i can reuse some parts to make a better machine. Apple just want to you keep spend a too much money in a machine that is too limited in terms of expansion. how many graphics cards you have? 3 or 4 and the new ones don't work because apple don't want. I love mac i will keep my macbook pro, my ipod, but a mac pro i think is a wast of money for a too limited machine in short term.