Comparison of ASRock Radeon RX 6600 XT Phantom Gaming D 8GB OC video card vs ASRock Radeon RX 6600 XT Challenger Pro 8GB OC video card by specs and benchmarks. 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, while video card ASRock Radeon RX 6600 XT Challenger Pro 8GB OC runs at 2.064 GHz+ 5 % base clock speed and has 8 GB of GDDR6 memory. The weight is different, 894 g vs 834 g. The TDP of the first video card is 160 W, and the second is 160 W . Compare the benchmark results to find out which video card is better.