Comparison of ASRock Radeon RX 6800 XT Phantom Gaming D 16G OC video card vs PowerColor Hellhound Radeon RX 7900 XT video card by specs and benchmarks. ASRock Radeon RX 6800 XT Phantom Gaming D 16G OC runs at 1.875 GHz+ 3 % base clock speed and has 16 GB of GDDR6 memory, while video card PowerColor Hellhound Radeon RX 7900 XT runs at 1.875 GHz+ 3 % base clock speed and has 20 GB of GDDR6 memory. The weight is different, 1784 g vs --. The TDP of the first video card is 300 W, and the second is 300 W . Compare the benchmark results to find out which video card is better.