I'd guess that jaca got some numbers/models confused.

Now I'm not sure if cards were added but these have been working for a while (and I used all of them):

- buildin X600XT in the iMac iSight
- buildin 128MB 9700 in PowerBooks
- genuine 256MB 9650 from the 2.7GHz G5

Aftermarket/flashed cards (even those sold as Mac compatible) do not work.

A 2nd GFX card like the Voodoo3 is a valid option for PMacG4 but there is an issue with the G5. On a Pegasos you would need to have that as AGP and the Radeon in PCI to get it to work.