Comparison of XFX AMD Radeon RX 570 RS 8GB Black Edition video card vs Sapphire Radeon RX Vega 56 video card by specifications and benchmarks. XFX AMD Radeon RX 570 RS 8GB Black Edition runs at 1.168 GHz base clock speed and has 4 GB of GDDR5 memory, while video card Sapphire Radeon RX Vega 56 runs at 1.156 GHz base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 150 W, and the second is 210 W. Compare the table of benchmark results to find out which graphic card is better.