Comparison of GIGABYTE GeForce GTX 1080 Founders Edition 8G video card vs ASUS TUF Gaming X3 GeForce GTX 1660 video card by specifications and benchmarks. GIGABYTE GeForce GTX 1080 Founders Edition 8G runs at 1.607 GHz base clock speed and has 8 GB of GDDR5X memory, while video card ASUS TUF Gaming X3 GeForce GTX 1660 runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory. The TDP of the first video card is 180 W, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.