The Mac drivers seem to be based off of an ATI Radeon 9700 driver and are built into the OS newer drivers weren't necessary for the 9800 install. The installation process is simple you don't uninstall any drivers, you just shut the machine down, remove the 9600 Pro and install the 9800 Pro. The internals of the G5 are pretty neatly organized and there's no spare power cable dangling around where the AGP slot is, so going with AGP Pro was almost necessary.
The 9800 is an AGP Pro card, which is how ATI avoids using an external power source for the card itself. The OEM Radeon 9800 Pro is built on a similar blue PCB but it has a fan, which inherently makes it louder than the OEM 9600 Pro. The card itself is otherwise identical to the PC version, but with an ADC and a DVI connector on it. The OEM Radeon 9600 Pro is a fanless AGP 8X solution built on a blue PCB.
The OEM Radeon 9800 Pro card came in today and I didn't waste any time in replacing the Radeon 9600 that was in the G5.
