Comparison of ASRock AMD Phantom Gaming X Radeon RX 580 8G OC video card vs ASUS Dual Radeon RX 580 OC 4G video card by specifications and benchmarks. ASRock AMD Phantom Gaming X Radeon RX 580 8G OC runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card ASUS Dual Radeon RX 580 OC 4G runs at 1.257 GHz base clock speed and has 4 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.