Comparison of ASRock Radeon RX 580 Phantom Gaming U 8G OC video card vs XFX Radeon RX 580 Double Dissipation 8GB video card by specs and benchmarks. ASRock Radeon RX 580 Phantom Gaming U 8G OC runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card XFX Radeon RX 580 Double Dissipation 8GB 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.