I never said it had to seem like the miner had an ROI i asked for the best Gh to Wattage ratio. and the First one posted is currently the best if it runs at that wattage and Mining speed.
so you think a u3 at 1 watt per gh doing 63 gh is 1 watt.
the u3 is 1 watt at the wall with a quality psu. with a shitty 80% brick it is 1.25 watts at the wall.
you have to buy one from asic puppy and get the custom router + firm ware.
It is not much of a bargain. .
The truth is your choice to be in the range you pick of 50 to 65 gh kills most picks.