Comparison of ASRock Radeon RX 570 Phantom Gaming U 8G OC video card vs XFX AMD Radeon RX 570 RS 4GB Black Edition video card by specs and benchmarks. ASRock Radeon RX 570 Phantom Gaming U 8G OC runs at 1.168 GHz base clock speed and has 8 GB of GDDR5 memory, while video card XFX AMD Radeon RX 570 RS 4GB Black Edition runs at 1.168 GHz base clock speed and has 4 GB of GDDR5 memory. The weight is different, -- vs --. The TDP of the first video card is 150 W, and the second is 150 W . Compare the benchmark results to find out which video card is better.