Comparison of PowerColor Red Devil Radeon RX 7900 XT video card vs ASUS ROG Strix LC Radeon RX 6800 XT OC video card by specifications and benchmarks. PowerColor Red Devil Radeon RX 7900 XT runs at 1.500 GHz base clock speed and has 20 GB of GDDR6 memory, while video card ASUS ROG Strix LC Radeon RX 6800 XT OC runs at 1.925 GHz+ 5 % base clock speed and has 16 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.