I thought this would be great, til I found out the mirrored drive door G4 I have ALREADY HAS THE QUIET Power supply in it! The machine is just bareable until the second fan kicks on (it's on a thermostat I assume) it's like a feakin 747 taking off. But according to Apple, the machine I have has the quiet supply. OH WELL. At least this machine is in a machine room, but we were planning on getting another one for a second PT's room where the computer is going in the same room. Does anyone know if the 1.42 Ghz G4's have the same "Quiet" cooling system? Tim