Comparison of GIGABYTE Radeon RX 570 Gaming 8G MI video card vs ASRock AMD Phantom Gaming X Radeon RX 570 4G OC video card by specs and benchmarks. GIGABYTE Radeon RX 570 Gaming 8G MI runs at 1.178 GHz+ 1 % base clock speed and has 8 GB of GDDR5 memory, while video card ASRock AMD Phantom Gaming X Radeon RX 570 4G OC runs at 1.178 GHz+ 1 % 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.