Dear suneth, I prefer GTX 1070 over Tesla K20, higher performance and cheaper than TK20. You can increase processor core to 10 to 12 or 14 if you have sufficient budget Dual Intel Xeon Processor E5-2640 v4 (10C, 2.4GHz, 3.4GHz Turbo, 2133MHz, 25MB, 90W Intel C612 64GB (8x8GB) 2400MHz DDR4 RDIMM ECC 1TB or 2TB GTX 1070 x2 or 1x GTX 1070 and GT740