Comparison of Sapphire Radeon RX 5700 XT 8G video card vs XFX Radeon RX Vega 64 Black Fan video card by specifications and benchmarks. Sapphire Radeon RX 5700 XT 8G runs at 1.605 GHz base clock speed and has 8 GB of GDDR6 memory, while video card XFX Radeon RX Vega 64 Black Fan runs at 1.247 GHz base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 225 W, and the second is 295 W. Compare the table of benchmark results to find out which graphic card is better.