Comparison of MSI Radeon RX 6800 XT Gaming X Trio 16G video card vs Gainward GeForce RTX 3090 Phantom GS video card by specifications and benchmarks. MSI Radeon RX 6800 XT Gaming X Trio 16G runs at 1.850 GHz+ 1 % base clock speed and has 16 GB of GDDR6 memory, while video card Gainward GeForce RTX 3090 Phantom GS runs at 1.395 GHz base clock speed and has 24 GB of GDDR6X memory. The TDP of the first video card is 300 W, and the second is 420 W+ 20 %. Compare the table of benchmark results to find out which graphic card is better.