The victimof: Since people do their power calculations in different ways, to compare apples and apples, it's preferable to just report power at the wall divided by total number of cards. That's all that matters anyway for determining efficiency. By that measure, I've never seen a rig that pulls less than ~120W/card at a decent hash rate. Za1n's 714W result is impressive, well done. I find that believable, but I suspect Za1n is at the outer limit of reducing power without a substantial reduction in hashrate.
And none of this actually addresses the substantive point I made, i.e. that at a given power draw (say 1440W for a typical 110V circuit), it's more profitable to mine monero than eth.
Have you plugged your numbers into
http://whattomine.com/ to see if that statement holds true ?
You can get the power down further if you get an Intel Low Power CPU, 35watt TDP and a mobo which has better efficiency. And do remember, you can undervolt your CPU as well or lower clocks as well. Even, using one stick of DDR4, instead of 2 is around a 2.58watts saving.
Harder to do on the Intel CPU platform, very easy too on AMD CPU platforms.
I reckon, with that tinkering on the CPU system with a Platinum PSU, his rig would be around 660watts to 670watts.
And, Za1N could choose to lower the settings from 900mv and 1125mhz on the GPUs, for more power savings.
So, he could get him down to 650watts to 660watts
And, that system draw divided by the number of GPUs the motherboard can support - 6-18 GPU variation currently.
Thanks for the info, maybe I'll look into a low power cpu, maybe that can get a rig down to 700W.