How do you differentiate between Rev.1 and 2 Sawtooths

I have a powermac G4 Sawtooth and the power supply recently decided to go, My question is, is there a way to tell if I have a Rev.1 or Rev.2 just by looking at the board?
Markings on the case and PSU don't help because I bought a Replacement Motherboard for it which had wider white plastic clips, I need to know because I am not sure if i need the 237W PSU or th 200W PSU.
Thanks

so is the 2nd Generation AGP the Gigabit Model?

OK thanks for the help