I'll be straight up here.... I don't use my Mac Pros to run OSX. In fact I don't think I've even booted into OSX more than 5 times in total all the time I've had them. I'm running x64 specifically for 3dsmax & really wanted to upgrade the graphic cards so was obviously excited about the 8800 GT. It doesn't work - now what? I've read that you can take literally any PC PCIe card and it will work under Windows. Is this correct? I really couldn't give a sh*t if it works in OSX or not. If I need to use OSX I can always put the 7300 back in but it's so rare to be not an issue. So... 2 questions: 1. do all cards work under Windows? 2. what's the best "bang for buck" on the PC side at the moment? cheers!