[.eXe]

Can anyone give me a rough guesstimate of the monthly cost of running 2 DL380 G4 servers 24/7?

The PSU draws about 550W. I'm talking headless, too.

Thanks,
Evil.

[webdev77]

600W average power draw combined.
14.4kWh per day.
432kWh per month.

Somewhere between $50 and $60 most likely (assuming an average rate of 12 cents per kWh).