Why buy two PCI cards when you can get all the high speed connectivity you need with one Adaptec DuoConnect AUA-3020A PCI Controller Card? With USB 2.0 and FireWire connections on a single card, you save both money and valuable PCI slot!
This card is not compatible with G5 PCI-X slot.

Mac OS 9.0.4 or later, Mac OS X 10.2.8 or later
Power Mac G3 Beige Rev. 2 or later
USB works as USB 2.0 with OS X 10.2.8 or later, and it works as USB 1.1 with OS 9.