This ATI Press Release reports that the Radeon 7500 is the card of choice in the PowerMac G4:
The RADEON 7000 will be featured in the IBM NetVista M Series, the HP Compaq Presario 6000 series and the Dell Precision Workstation 340 while the RADEON 7500 is the card of choice for Apple's PowerMac G4, Hewlett-Packard's EVO-310, Fujitsu's FMV-DESKPOWER and Dell's Optiplex GX260.
Only the low-end (PowerMac G4 800) offering currently supplies the 7500 as a standard config, while others utilize the NVidia GeForce.
Submitted by Quark