Comparison of MSI Radeon RX 590 Armor 8G OC video card vs Sapphire Nitro+ Radeon RX 6900 XT video card by specifications and benchmarks. MSI Radeon RX 590 Armor 8G OC runs at 1.469 GHz base clock speed and has 8 GB of GDDR5 memory, while video card Sapphire Nitro+ Radeon RX 6900 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 220 W-2 %, and the second is 340 W+ 13 %. Compare the table of benchmark results to find out which graphic card is better.