I have a PowerMac G4 Quicksilver 733MHz with two graphics cards (AGP GeForce2 MX and a PCI card, not sure which) as you can see on this video. http://youtu.be/F0zUEFz4i4Q I want to add a third PCI Card for a third screen (for a special project I have in mind). Before I start looking around to purchase on eBay, I would like to know if it is possible for the system to support and recognize a third Graphics card and also recognize the drivers for it. I guess if it's workable, it should be another PCI card. Would it work on Mac OS X 10.4 or Mac OS X 10.5? How about Mac OS 9? Has anyone done this? Any recomendations will be appreciated. Thank you in advance.