Comparison of PowerColor Fighter Radeon RX 6600 XT video card vs Sapphire Toxic Radeon RX 6900 XT Air Cooled video card by specifications and benchmarks. PowerColor Fighter Radeon RX 6600 XT runs at 1.968 GHz base clock speed and has 8 GB of GDDR6 memory, while video card Sapphire Toxic Radeon RX 6900 XT Air Cooled runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 160 W, and the second is 400 W+ 33 %. Compare the table of benchmark results to find out which graphic card is better.