I was considering a mac pro before the update, but I'll be sticking with Windows for serious work this time around. However, my G4 PowerMac is falling apart, the hard disk in particular. Not to mention that I can't do what I want to do on it anymore. I want to replace it. I did some searching around the forums and found some older threads with issues like not being able to switch GPUs in Windows. Is this still a problem? If if it is still a problem, which GPU is automatically used? Thanks for your assistance.