Comparison of MSI Radeon RX 6900 XT 16G video card vs MSI Radeon RX Vega 56 Air Boost 8G OC video card by specifications and benchmarks. MSI Radeon RX 6900 XT 16G runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card MSI Radeon RX Vega 56 Air Boost 8G OC runs at 1.181 GHz+ 2 % base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 300 W, and the second is 210 W. Compare the table of benchmark results to find out which graphic card is better.