So the reseller can sell cheaper than the supplier and deliver earlier... Yeah right.
Not too mention 2 to 3x the electrical efficiency of Bitmine's spec.
Check out the Coincraft A1 chip and you'll know it can run at different levels and specified power levels? So the users can tune to power availability or cost/benefit needs. Is Google not working for that sort of search for you? I agree packaging makes a difference to overall wall socket draw, but 80% rule should indicate that the ASIC's on the boards are big consumers of overall power...?
http://advancedminers.com/coincraft-a1-datasheet-specifications-released/http://bitmine.ch/?page_id=25