I have replied a bit about this in another thread and again, the Power Mac 5500 only has one PCI slot, if it already has a USB card in it, you cannot install a second video card anywhere else in the Mac. In my Mac, I have a Voodoo 3 2000 PCI video card installed in the PCI slot and it does work OK. Tomb Raider 2 looks very good with this card in the 5500. I only use the video card occassionally because you have to connect a second monitor to the card and that does need a bit of desk space.