Comparison of MSI Radeon RX 6900 XT Gaming Z Trio 16G video card vs Sapphire Nitro+ Radeon RX Vega 56 video card by specifications and benchmarks. MSI Radeon RX 6900 XT Gaming Z Trio 16G runs at 1.925 GHz+ 5 % base clock speed and has 16 GB of GDDR6 memory, while video card Sapphire Nitro+ Radeon RX Vega 56 runs at 1.266 GHz+ 10 % base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 300 W, and the second is 325 W+ 55 %. Compare the table of benchmark results to find out which graphic card is better.