Comparison of ASRock Radeon RX 5500 XT Challenger D 8G OC video card vs ASRock Radeon RX 6600 XT Phantom Gaming D 8GB OC video card by specifications and benchmarks. ASRock Radeon RX 5500 XT Challenger D 8G OC runs at 1.685 GHz+ 5 % base clock speed and has 8 GB of GDDR6 memory, while video card ASRock Radeon RX 6600 XT Phantom Gaming D 8GB OC runs at 2.064 GHz+ 5 % base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 130 W, and the second is 160 W. Compare the table of benchmark results to find out which graphic card is better.