Comparison of Sapphire Nitro+ Radeon RX 6900 XT video card vs Colorful GeForce RTX 3090 NB-V video card by specifications and benchmarks. Sapphire Nitro+ Radeon RX 6900 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card Colorful GeForce RTX 3090 NB-V runs at 1.395 GHz base clock speed and has 24 GB of GDDR6X memory. The TDP of the first video card is 340 W+ 13 %, and the second is 350 W. Compare the table of benchmark results to find out which graphic card is better.