Comparison of MSI Radeon RX 580 Gaming 4G video card vs GIGABYTE Radeon RX 6900 XT Gaming OC 16G video card by specifications and benchmarks. MSI Radeon RX 580 Gaming 4G runs at 1.257 GHz base clock speed and has 4 GB of GDDR5 memory, while video card GIGABYTE Radeon RX 6900 XT Gaming OC 16G runs at 1.875 GHz+ 3 % base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 185 W, and the second is 340 W+ 13 %. Compare the table of benchmark results to find out which graphic card is better.