I have just purchased a G5 powermac 2 x 2.3Ghz which currently has a GeForce 6600 graphics card installed with 2 dvi ports. My question is, can I purchase an identical card and install it in the pci slot above the current one, in order to have 4 dvi ports for monitors? I assume there is drivers to install or at least steps to take before I will get 4 useable dvi ports. Any help anyone can offer will be greatly appreciated! Thank you, Dan.