Just to resurect an old inquiry, has anyone managed to get a secondary PCI graphics card to work in a G5?
Personally, I don't even know if the G5 PCI-X models reduce clock speeds to accomodate PCI cards (once they are plugged in).
Although, I assume that if someone has managed to get an SB Live cards d working in one of these (which I also unsure of) then the clock provide to these slots must slow down (as there is no way a PCI card will remain functional at 100 MHz).

[ Edited by Jim 30.05.2015 - 14:06 ]