Yeah I'm pretty happy with my SP20.

First unit had to be RMA'ed, as it only had 7 out of 8 ASICS going, but even with that, it was pulling 1300 gh/s. They shipped me the new replacement unit as soon as I got a tracking number for the old one, so it was only a couple of days worth of lost hashing.

New unit, is pulling 1500 and change gh/s with 240/240/240/240 W per PCI-E cable, running on a 1000 W power supply.

I have taken it to 1.7 gh/s with 2 different power supplies, 2 x PCI-E cables each, with 270x4, but it loses efficiency.

I'm happy with one power supply feeding it with a slight underclock and underpower.

Would buy one again, but I don't have the power to run all my miners. I'm already running a cable from the garage, and a cable from the other room. Lol !

Sucking down juice from 3 circuits.