Comparison of Sapphire Pulse Radeon RX 6600 video card vs EVGA GeForce GTX 1660 XC BLACK GAMING 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 EVGA GeForce GTX 1660 XC BLACK GAMING runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory. The TDP of the first video card is 132 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.