Comparison of Sapphire Toxic Radeon RX 6900 XT Limited Edition video card vs NVIDIA GeForce RTX 3090 Founders Edition video card by specifications and benchmarks. Sapphire Toxic Radeon RX 6900 XT Limited Edition runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card NVIDIA GeForce RTX 3090 Founders Edition runs at 1.395 GHz base clock speed and has 24 GB of GDDR6X memory. The TDP of the first video card is 400 W+ 33 %, and the second is 350 W. Compare the table of benchmark results to find out which graphic card is better.