Comparison of Sapphire Pulse Radeon RX 580 8G G5 video card vs XFX Radeon RX Vega 56 video card by specifications and benchmarks. Sapphire Pulse Radeon RX 580 8G G5 runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card XFX 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 185 W, and the second is 210 W. Compare the table of benchmark results to find out which graphic card is better.