Holy hell, I forgot how much power well.bhtooefr.org, my IBM POWER 520 Express, with 2x 4.2 GHz POWER6 Dual Cores, pulled at idle.
The answer is 465.5 watts based on my current UPS load (62.4%), versus my UPS load without it (14.9%), and my UPS's 980 watt (1500 VA, but, well, power factor) rating.
But, hey, it gives me pretty green screens like this: