Comparison of ASRock Radeon RX 5700 XT Phantom Gaming D 8G OC video card vs PowerColor Red Devil Radeon RX 6800 XT video card by specifications and benchmarks. ASRock Radeon RX 5700 XT Phantom Gaming D 8G OC runs at 1.690 GHz+ 5 % base clock speed and has 8 GB of GDDR6 memory, while video card PowerColor Red Devil Radeon RX 6800 XT runs at 1.900 GHz+ 4 % base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 225 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.