Going through the FPGAs board manufacturers came across the HMC(Hybrid Memory Cube) http://static6.arrow.com/aropdfconversion/a034c723e572f45efe84162a58a14f71cedf33fa/hmc_webinar_july_2017.pdf.pdf promising technology basically coupled with UlTraScale FPGA or Intels Aria 10 FPGA you have the bandwidth and capacity to crunch any memory hard algo more efficiently than GPUs and even todays ASICs. Its supper expensive compared to ddr3-4 but in long term investment will return its money