So it's time for nvidia. 1080 at 290watt of 760sols, 1070 at 130watt of 420sols. Interesting!
I'm consistently getting 420 sols at 150watts on 1070s with EWBF (as reported by nvidia-smi)
When I did my spreadsheet it looked like nvidia was the better deal for ROI on ZEC. Don't have any RADEONs to compare to, though, right now.