Unless you prefer eu based company technobit 
I can assure all of you that I am having eight chip coincraft board in hand hashing like I beast 240-250 gh
I can assure all of you that I am having eight chip coincraft board in hand hashing like I beast 240-250 ghAnd pulling around 3W/GH I believe, albeit overclocked, but without even accounting for the PSU inefficiency.
Based on the same chip, AMT are still claiming 0.5-0.75 W/GH at the wall, and thats up from their previous ludicrous claim of 0.25-0.5W/GH.
To quote AMTs favorite shill:
Yes, I do believe the unit will produce up to 1.2THs, running around 600Watts.