Comparison of PowerColor Radeon RX 5700 XT Red Dragon video card vs Sapphire Toxic Radeon RX 6900 XT Limited Edition video card by specifications and benchmarks. PowerColor Radeon RX 5700 XT Red Dragon runs at 1.650 GHz+ 3 % base clock speed and has 8 GB of GDDR6 memory, while video card Sapphire Toxic Radeon RX 6900 XT Limited Edition runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 225 W, and the second is 400 W+ 33 %. Compare the table of benchmark results to find out which graphic card is better.