With the release of 3.18 (or the 1st 3.19beta to be more precise) I decided to check up on some mothballed systems:

PMac G4 QuickSilver 1.8GHz Radeon9000:
idle 55W compiling 83W standby 10W
idle with 15" ADC 75W
-> far to high standby to be connected to mains 24/7, despite the slower CPU and smaller screen it pretty close to the iMac and it still lacks the USB2,SBLive! and Voodoo3 I had in there