video choices

I have a gigabit powermac w dual 500mhz,1.5gb ram.
my question is : if the agp output is only 2x speed and my pci slot only support 64bit 33mhz output. so which do i slip a newer video card into to improve my overall video experience?

problems. problems.

Any ideas will be helpful.

My 400Mhz (SawTooth - upgraded to 1.3Ghz) G4 has the same limitations. I simply bought a new AGP Graphics card (ATI Radeon 9000/128Mb) with more RAM to enable my machine to handle the few games I play better (Halo, F-18, SIMS, etc). It also included a DVI connector which seems to work better for me than the VGA connector did. It does display the games better, but putting a PCI based card in would have bought me nothing more because of the limited bus speed. I'm not even sure the AGP Macs will do PCI graphics, but some may..