Comparison of ASRock Radeon RX 6600 XT Challenger D 8GB OC video card vs PowerColor Radeon RX 6800 Red Devil video card by specifications and benchmarks. ASRock Radeon RX 6600 XT Challenger D 8GB OC runs at 2.000 GHz+ 2 % base clock speed and has 8 GB of GDDR6 memory, while video card PowerColor Radeon RX 6800 Red Devil runs at 1.850 GHz+ 9 % base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 160 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.