Comparison of Sapphire Nitro+ Radeon RX Vega 64 video card vs AMD Radeon RX 6400 - Reference Data video card by specifications and benchmarks. Sapphire Nitro+ Radeon RX Vega 64 runs at 1.373 GHz+ 10 % 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 295 W, and the second is 53 W. Compare the table of benchmark results to find out which graphic card is better.