My trusty old HD4870 card has died after many years of use. I need a new graphics card. I need advice. You see I don't use this old machine for anything other than playing games on now. Games running in Windows 7 SP1. It has no OSX software on it hard drive at all. From boot it goes, after a short pause straight into windows. I now do all my work on a MacMini. I am loathed to shell out a huge wad of cash on a new gaming rig, and wonder that since the Mac Pro has a PCI express 2.0 slot for graphics cards, can I just put any Windows graphics card in? If it is possible, I would not be bothered if I could no longer use it in OSX ever again. This really is its last gasp/chance.