Comparison of MSI Radeon RX 580 Armor MK2 8G OC video card vs Sapphire Toxic Radeon RX 6900 XT Air Cooled 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 Sapphire Toxic Radeon RX 6900 XT Air Cooled runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 185 W, and the second is 400 W+ 33 %. Compare the table of benchmark results to find out which graphic card is better.