Comparison of AMD Radeon RX 6600 video card vs ASRock Radeon RX 6600 Challenger D video card by specs and benchmarks. AMD Radeon RX 6600 runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory, while video card ASRock Radeon RX 6600 Challenger D runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory. The weight is different, -- vs 627 g. The TDP of the first video card is 132 W, and the second is 132 W . Compare the benchmark results to find out which video card is better.