the pci-x 424 is the most compatible card
working in all of the above systems frm 1997-2014 powermac g3s, g4s, g5s hackintosh or windows pcs (provided they have a pci slot)
i own the pcix-424 and currently have it installed in a hackintosh q6600 /w 16gb ram but like i said its also g3/g4/g5 compatible and can be switched from my hackintosh to any of my macs... making it one of the best buys going.. if you arent interested in pro tools and have an interest in using intel pc hardware aswell as macs (the 324 card requires 5v pci slot so doesnt work in g5 but should be fine to go in a g3 or a g4)
its pretty insane just how compatible it is..
MOTU