Comparison of AMD Radeon RX 6800 XT video card vs MSI GeForce RTX 3090 Ventus 3X 24G OC video card by specifications and benchmarks. AMD Radeon RX 6800 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card MSI GeForce RTX 3090 Ventus 3X 24G OC 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 350 W. Compare the table of benchmark results to find out which graphic card is better.