Comparison of ASUS TUF GAMING Radeon RX 6900 XT OC video card vs ASRock Radeon RX 7900 XT 20GB video card by specs and benchmarks. ASUS TUF GAMING Radeon RX 6900 XT OC runs at 1.900 GHz+ 4 % base clock speed and has 16 GB of GDDR6 memory, while video card ASRock Radeon RX 7900 XT 20GB runs at 1.900 GHz+ 4 % base clock speed and has 20 GB of GDDR6 memory. The weight is different, 1700 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.