Given the G5 has only two DD slots, this card would be no use to it.
Given the price of current SATA DD, it's still a little early to use them in a G4.
Last possible case, the xServe. But would it be useful to put one in one of them, with two SATA DDs ?
One last thing: the theoretical output of a SATA bus exceeds the PCI theoretical output, and it is very superior to the effective output of the bus G4s used before Quick Silver models.
