Time to swap up my trusty old 8800GT on My 3.1 Mac Pro 2008. I know other folks have had problems with the 8800GT, but mine has never caused me any grief. I want to upgrade and would prefer to go with an apple certified card. I don't mind shelling out $400, but I hate the idea of spending my money on a 5870 with the 7xxx around the corner. My understanding is that a PCI-E 3.0 card like the 7xxx series should be fully backward compatible with PCI-E 2.0 x16 lanes that I have on my mac pro. My machine has an SDD for boot and 10 GB RAM and the only thing I find slow out in right now aside from the video card under certain circumstances are my 7200 rpm data drives. Unless something breaks, I wouldn't be surprised if I get another 5 years out of this machine with a few more SDD investment and a new GPU.