Comparison of PowerColor Red Devil Radeon RX 6900 XT Ultimate video card vs KFA2 GeForce RTX 3080 Ti HOF video card by specifications and benchmarks. PowerColor Red Devil Radeon RX 6900 XT Ultimate runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card KFA2 GeForce RTX 3080 Ti HOF runs at 1.365 GHz base clock speed and has 12 GB of GDDR6X memory. The TDP of the first video card is 300 W, and the second is 350 W. Compare the table of benchmark results to find out which graphic card is better.