Comparison of ASRock AMD Phantom Gaming D Radeon RX 580 4G OC video card vs GIGABYTE Radeon RX 580 D5 8G video card by specs 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 GIGABYTE Radeon RX 580 D5 8G runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory. The weight is different, -- vs --. The TDP of the first video card is 185 W, and the second is 185 W . Compare the benchmark results to find out which video card is better.