Comparison of Gainward GeForce GTX 1080 Ti Founders Edition video card vs ASUS Dual GeForce GTX 1660 TI video card by specifications and benchmarks. Gainward GeForce GTX 1080 Ti Founders Edition runs at 1.480 GHz base clock speed and has 11 GB of GDDR5X memory, while video card ASUS Dual GeForce GTX 1660 TI runs at 1.500 GHz base clock speed and has 6 GB of GDDR6 memory. The TDP of the first video card is 250 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.