I'm also working on this and will shortly be releasing free bitstreams with a 4% mining fee, supporting Xilinx VCU1525, Bittware XUPP3R, and Avnet KU040. ROI is around 90-200 days depending on the algorithm. I have constructed a GPU-style rig with 8 x VCU1525, I will post some pictures soon.
very interesting .
It is very demanding for programming.
How much the power consumption?
Did they take 5x advantage compared to GTX 1080 ?