Comparison of PowerColor Red Devil Radeon RX 6800 XT Limited Edition video card vs Gainward GeForce GTX 1660 SUPER Ghost OC video card by specifications and benchmarks. PowerColor Red Devil Radeon RX 6800 XT Limited Edition runs at 1.900 GHz+ 4 % base clock speed and has 16 GB of GDDR6 memory, while video card Gainward GeForce GTX 1660 SUPER Ghost OC runs at 1.530 GHz base clock speed and has 6 GB of GDDR6 memory. The TDP of the first video card is 300 W, and the second is 125 W. Compare the table of benchmark results to find out which graphic card is better.