How can I be certain that if I place a new graphics card on this computer it will be recognized and work properly. The motherboard has PCI-x, PCI-e x8, and PCI-e x1, slots. I tried an EVGA GeForce 6200 512MB but, it would not even let the computer boot. However n ATI Radeon 64MB did work; but, would not let me use the 64MB it would only recognize the on board 16MB. How can I make it direct to the graphic card or disable the on board 16MB limitation? Any help, assistance or suggestions will be greatly appreciated.