Comparison of XFX AMD Radeon RX 570 RS 4GB Black Edition video card vs Sapphire Pulse Radeon RX 580 8G G5 OC Lite video card by specifications and benchmarks. XFX AMD Radeon RX 570 RS 4GB Black Edition runs at 1.168 GHz base clock speed and has 4 GB of GDDR5 memory, while video card Sapphire Pulse Radeon RX 580 8G G5 OC Lite runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory. The TDP of the first video card is 150 W, and the second is 185 W. Compare the table of benchmark results to find out which graphic card is better.