Comparison of Sapphire Pulse Radeon RX Vega 56 video card vs AMD Radeon RX 6400 - Reference Data video card by specifications and benchmarks. Sapphire Pulse Radeon RX Vega 56 runs at 1.208 GHz+ 4 % base clock speed and has 8 GB of HBM2 memory, while video card AMD Radeon RX 6400 - Reference Data runs at base clock speed and has 4 GB of GDDR6 memory. The TDP of the first video card is 280 W+ 33 %, and the second is 53 W. Compare the table of benchmark results to find out which graphic card is better.