I have the first version of the mac pro the dual duo 2.66 intel xeon.(essentially a quad core) I have loaded this box up with raid,5tb of drive, 16gb ram... so on. The graphics card on this machine is a NVIDIA GeForce 7300 GT. I just started editing video and this card is not really cutting it for me but everything else on my system seems to be fine. Im having a really hard time finding compatible video cards because there are so many kinds of mac pros. I want a really good card and am willing to spend up to $500.