Comparison of Sapphire Pulse Radeon RX 6600 video card vs KFA2 GeForce GTX 1660 Super video card by specifications and benchmarks. Sapphire Pulse Radeon RX 6600 runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory, while video card KFA2 GeForce GTX 1660 Super runs at 1.530 GHz base clock speed and has 6 GB of GDDR6 memory. The TDP of the first video card is 132 W, and the second is 125 W. Compare the table of benchmark results to find out which graphic card is better.