Comparison of ASRock Radeon RX 6900 XT OC Formula 16GB video card vs ASRock Phantom Gaming X Radeon VII 16G video card by specs and benchmarks. ASRock Radeon RX 6900 XT OC Formula 16GB runs at 2.125 GHz+ 16 % base clock speed and has 16 GB of GDDR6 memory, while video card ASRock Phantom Gaming X Radeon VII 16G runs at 2.125 GHz+ 16 % base clock speed and has 16 GB of HBM2 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.