I want to upgrade the video card in my Mac Pro 1,1 (the first generation that came out in 2006). The "official" 9600 upgrade claims to require a latter generation Mac Pro. I'm just wondering if anyone has successfully hacked the 9600 to work in the Mac Pro 1,1. I don't see why it shouldn't be possible; the machine has PCI Express 16x slots and the necessary power connector for the card! I realize there's probably BIOS issues, but people have gotten strange hardware combinations to work, so I don't want to just "give up" without at least inquiring first. Anyone have success stories? This machine still has a lot of life left in it, but the Radeon x1900XT that's in it is starting to get long in the tooth. Oh, and working in OS X is a must. I'm not just doing this to play Windows games.