Comparison of PowerColor Liquid Devil Radeon RX 6900 XT Ultimate video card vs ASUS TUF Gaming Radeon RX 7900 XT OC Edition video card by specifications and benchmarks. PowerColor Liquid Devil Radeon RX 6900 XT Ultimate runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card ASUS TUF Gaming Radeon RX 7900 XT OC Edition runs at 1.500 GHz base clock speed and has 20 GB of GDDR6 memory. The TDP of the first video card is 300 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.