Comparison of SAPPHIRE Radeon RX 6700 XT video card vs Gainward GeForce GTX 1660 Ghost video card by specifications and benchmarks. SAPPHIRE Radeon RX 6700 XT runs at 2.321 GHz base clock speed and has 12 GB of GDDR6 memory, while video card Gainward GeForce GTX 1660 Ghost runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory. The TDP of the first video card is 230 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.