Comparison of MSI Radeon RX 570 Mech 2 8G OC video card vs ASRock Radeon RX 6600 XT Challenger ITX 8GB video card by specifications and benchmarks. MSI Radeon RX 570 Mech 2 8G OC runs at 1.178 GHz+ 1 % base clock speed and has 8 GB of GDDR5 memory, while video card ASRock Radeon RX 6600 XT Challenger ITX 8GB runs at 1.968 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 150 W, and the second is 160 W. Compare the table of benchmark results to find out which graphic card is better.