Comparison of MSI Radeon RX 580 Armor MK2 8G OC video card vs GIGABYTE Radeon RX 6600 XT Gaming OC Pro 8G video card by specifications and benchmarks. MSI Radeon RX 580 Armor MK2 8G OC runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory, while video card GIGABYTE Radeon RX 6600 XT Gaming OC Pro 8G runs at 1.968 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 185 W, and the second is 160 W. Compare the table of benchmark results to find out which graphic card is better.