It's drawing 4.75 amps @120v. About 570 Watts. I have it running from a 550W Rosewill 80Plus Gold PSU. Will probably have to switch to something bigger...
FWIW, my Black Widow that arrived an hour ago is hashing away at 14MH/s.
How much power is it drawing? I have mine plugged into a 650w EVGA 80Gold PSU that's drawing 89w at idle (300w with the BW plugged in). AS SOON as I start mining, it shuts down and I have to CMOS reset my PC to even get it to boot back up.