P102 eth performance from my factory source. $700 usd, but have to pre-order now and receive in early May.
Seems less efficient in terms of hash/watt compared to P104 which can do 37mh/s at 120w.
This is tempting, but I'm holding off expansion till end of GTC. Next gen just around the corner.
Or standard 1070 cards I have running a bit over 31 Mhash at 98 to 103 watts (The 98 card has one of my modded fan setups though, so add perhaps one more watt for the external 5V power to the pair of fans).