I just picked up one of these. I figured I should protect my $3k investment with a battery backup. Anyway, the thing I find interesting is the LCD on the front. It gives a handy read out of how much power is being used by the connected components. I'm running a mac pro with the following specs: Dual 2.66 2gigs ram (4x512) Dual SuperDrives Airport Bluetooth WD Raptor 150gig SATA Seagate 320gig SATA 2x WD 400gig in RAID1 SATA ATI X1900XT Monitor is a Dell 2005FPW 20 Widescreen LCD When the system is sitting idle with the monitor on it pulls just 220 watts. Turn off the monitor and that number drops to 170 watts. According to Apple, this is exactly where it should be. As soon as I load a game, Warcraft 3 Frozen Throne, power usage jumps to 310 watts with the monitor on. 265 with the monitor off. When sleeping, the power draw is 8 watts with monitor. Around 5 watts without. Waking from sleep shows a max draw of 285 watts with the monitor waking at the same time. 250 watts without. Encoding a movie in iMovie in mpeg4 format shows 270 watts with the monitor, 220 watts without. Obviously this isn't a super scientific method for testing the power draw of a Mac Pro, but I found it interesting anyway.