Overall the XC7K325T based board is about 16x less power than a VCU1525.
If you’re looking in that range, I might as well start taking pre-orders for my M.2 accelerator since it’s ready. It has a 200k LE 7 series chip and 1GB of DDR3 + 4x PCIe (2.0 atm). $329 for the very fast version, $199 for the lower end (100k LE/512MB DDR3). Uses a M.2 M-Key / Nvme slot, or a $10 PCIe adapter.
PCIe 4x? does it need the 4x? ie, will running it on a single PCIe lane hurt performance?
i have an onda mining board with 8 full size 16x slots but i believe they run in 1x mode, so any PCIe ->m2 adapter card would run at 1x.