Power Mac G5 Quad (2.5 Ghz)
4 GB RAM
Mac OS 10.4.11
It runs fine with the GeForce 6600 installed. I just got a Quadro 4500 FX off eBay (uh oh, the seller said it was for the G5) and I get no picture at all, although the system seems to be running: the startup chime sounds, and after a minute...