Comparison of Sapphire Toxic Radeon RX 6900 XT Extreme Edition video card vs GIGABYTE GeForce GTX 1660 SUPER GAMING OC 6G video card by specifications and benchmarks. Sapphire Toxic Radeon RX 6900 XT Extreme Edition runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card GIGABYTE GeForce GTX 1660 SUPER GAMING OC 6G runs at 1.530 GHz base clock speed and has 6 GB of GDDR6 memory. The TDP of the first video card is 430 W+ 43 %, and the second is 125 W. Compare the table of benchmark results to find out which graphic card is better.