Comparison of ASRock AMD Phantom Gaming X Radeon RX 570 4G OC video card vs ASRock Radeon RX 570 Phantom Gaming U 8G OC video card by specifications and benchmarks. ASRock AMD Phantom Gaming X Radeon RX 570 4G OC runs at 1.194 GHz+ 2 % base clock speed and has 4 GB of GDDR5 memory, while video card ASRock Radeon RX 570 Phantom Gaming U 8G OC runs at 1.168 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 150 W. Compare the table of benchmark results to find out which graphic card is better.