Comparison of ASRock AMD Phantom Gaming U Radeon RX 590 8G OC video card vs GIGABYTE Radeon RX 590 Gaming 8G video card by specs and benchmarks. ASRock AMD Phantom Gaming U Radeon RX 590 8G OC runs at 1.469 GHz base clock speed and has 8 GB of GDDR5 memory, while video card GIGABYTE Radeon RX 590 Gaming 8G runs at 1.469 GHz base clock speed and has 8 GB of GDDR5 memory. The weight is different, -- vs --. The TDP of the first video card is 225 W, and the second is 225 W . Compare the benchmark results to find out which video card is better.