If the PowerBook uses 50W and the G4 uses 150W and he is paying 15¢/kwh:
$5.40/mo to run the PowerBook
$16.20/mo to run the G4 Tower
I don't think the G4 or even the PowerBook would be using that much though.
You can strip down the G4 some, unplug the CD drive and any unused cards, you basically want the hard drive, motherboard, video card, and PSU. Change to onboard ethernet if you use a card. If there's a backup drive make sure it spins down when not in use. Unplug USB devices when not in use.
You could probably get an entire PowerBook or maybe an iBook 500 MHz for $100 if you didn't care about the battery or screen anomalies. You could also get a G4 for $50 or less if you're looking in the right place. It might takes 5-6 months for the energy savings to catch up, but honestly if you don't have $10/mo to spare for more power or $50 to spare when the server dies then maybe running a server is not a good project for you.
$5.40/mo to run the PowerBook
$16.20/mo to run the G4 Tower
I don't think the G4 or even the PowerBook would be using that much though.
You can strip down the G4 some, unplug the CD drive and any unused cards, you basically want the hard drive, motherboard, video card, and PSU. Change to onboard ethernet if you use a card. If there's a backup drive make sure it spins down when not in use. Unplug USB devices when not in use.
You could probably get an entire PowerBook or maybe an iBook 500 MHz for $100 if you didn't care about the battery or screen anomalies. You could also get a G4 for $50 or less if you're looking in the right place. It might takes 5-6 months for the energy savings to catch up, but honestly if you don't have $10/mo to spare for more power or $50 to spare when the server dies then maybe running a server is not a good project for you.