Comparison of MSI Radeon RX 590 Armor 8G OC video card vs AMD Radeon RX 6400 - Reference Data 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 AMD Radeon RX 6400 - Reference Data runs at base clock speed and has 4 GB of GDDR6 memory. The TDP of the first video card is 220 W-2 %, and the second is 53 W. Compare the table of benchmark results to find out which graphic card is better.