Comparison of ASRock AMD Phantom Gaming D Radeon RX 580 4G OC video card vs ASRock AMD Phantom Gaming M2 Radeon RX 580 8G video card by specifications and benchmarks. ASRock AMD Phantom Gaming D Radeon RX 580 4G OC runs at 1.257 GHz base clock speed and has 4 GB of GDDR5 memory, while video card ASRock AMD Phantom Gaming M2 Radeon RX 580 8G runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory. The TDP of the first video card is 185 W, and the second is 185 W. Compare the table of benchmark results to find out which graphic card is better.