Hey MMi, A question on a Graphite AGP G4

To be far the ATI Rage Pro 128 Aint the most powerful graphics board in the world, 16mb right. Now the machine is an AGP one. Now heres the million dollar question, can I rip the Rage Pro out and Fit a Mac PCI one in a free PCI slot. I was thinking of a card like this one to be specific. If i want to run leopard on it im gonna need a bigger and faster card. Leopardassist FTW!