Comparison of ASRock Radeon RX 6600 XT Phantom Gaming D 8GB OC video card vs PowerColor Radeon VII video card by specifications 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 PowerColor Radeon VII runs at 1.400 GHz base clock speed and has 16 GB of HBM2 memory. The TDP of the first video card is 160 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.