Comparison of ASRock Radeon RX 5700 XT Challenger Pro 8G OC video card vs ASRock Radeon RX 6800 XT Phantom Gaming D 16G OC video card by specifications and benchmarks. ASRock Radeon RX 5700 XT Challenger Pro 8G OC runs at 1.650 GHz+ 3 % base clock speed and has 8 GB of GDDR6 memory, while video card ASRock Radeon RX 6800 XT Phantom Gaming D 16G OC runs at 1.875 GHz+ 3 % 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.