Comparison of MSI Radeon RX 5700 Mech OC video card vs ASRock Radeon RX 6600 Challenger ITX video card by specifications and benchmarks. MSI Radeon RX 5700 Mech OC runs at 1.515 GHz+ 3 % base clock speed and has 8 GB of GDDR6 memory, while video card ASRock Radeon RX 6600 Challenger ITX runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 180 W, and the second is 132 W. Compare the table of benchmark results to find out which graphic card is better.