Maybe he has three top of the line GPUs in there wink

This MacWorld test was interesting:

http://www.macworld.com/article/2146360/lab-tested-the-mac-pro-daisy-chain-challenge.html

1 MacPro, 36 external hard drives, four monitors. Total peak power draw, 865 watts.

Things certainly have got more efficient in recent years.
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Remind me to change my signature to something more interesting someday