I have an older ATI Readeon X800 XT Mac Edition card in my Power Mac G5. it's AGP and I'd like to upgrade it to something more powerful. Although I'm having a hard time finding anything AGP for the MAC. Are AGP cards for the Mac very limited? Or can I assume most AGP cards for a PC will work in my G5 assuming that there are drivers for them? Can anybody suggested a good newer AGP card?