As I am waiting for Barefeats to have fun with the Quadro, some preliminary thoughts might be fun to think about. - The Quadro 4000 is supported on the Mac Pro '08, the Radeon 5870 is not. - X-Plane 9: the Radeon 5870 is not faster than the 4870 in the '08 Mac Pro. Maybe the Quadro 4000 will be faster? - 2 GB VRAM on the Quadro... any chance gaming will benefit? - Usually the "Pro-3D" card loses to good consumer 3D cards in gaming. Will this be true this time too?