[krupan]

A quick google search turns up at least one devboard with a beefy FPGA and HMC:

https://www.xilinx.com/products/boards-and-kits/dk-u1-vcu110...

Not cheap, and probably not available in bulk, but cheaper than custom PCB R&D.

[dragontamer]

Not cheap, but it would be insane for cryptomining purposes if you somehow got a sizable supply.

16.5 MB of internal RAM. 18MB of QDR-IV SRAM. 125MB of RLDRAM 3. 2GB of HMC.

That's plenty of RAM to pretty much crush Ethash, Cryptonight and more.