Pozor na ty Xilinxy...tohle vypada jako celkem spravnej vypocet (z commentu pod videem): LEAKED 1.9Gh/s Ethereum Mining FPGA Cards Footage. https://www.youtube.com/watch?v=x9DJ18y8LcI
There's something wrong with the shown hashrate based on the available memory bandwidth for this Xilinx FPGA card.
We know each hash of ETH requires 8192 bytes of memory access (ie. DAG access per hash is done by a 64 iteration loop with each iteration accessing 128 bytes of the DAG, thus 128 bytes x 64 iterations = 8192 bytes per hash). Now a hashrate of 1.9 GH/s means it would require around 15564.8 gigabytes per second of memory bandwidth. In terms of bits this means that hashrate requires around 124518.4 gigabits per second.
This Xilinx card comes with 4x DDR4 DIMMS, with each DIMM providing a 64 bit data bus, thus the 4x DIMMS provide a total data bus width of 256 bits. The required memory bandwidth of 124518.4 gigabits per second (to get the 1.9 GH/s hashrate) means the DD4 DIMM module must have a speed per data pin of around 486.4 GHz (equivalently 486400 MHz). But there doesn't exist any DDR4 DIMM with data pin speeds which reach the needed 486.4 GHz.
So the DDR4 DIMMs used by this Xilinx card can't even provide the required memory bandwith to give the hashrate shown.