Comparison of PNY GeForce GTX 1080 Ti Founders Edition video card vs GIGABYTE GeForce GTX 1660 D5 6G video card by specifications and benchmarks. PNY GeForce GTX 1080 Ti Founders Edition runs at 1.480 GHz base clock speed and has 11 GB of GDDR5X memory, while video card GIGABYTE GeForce GTX 1660 D5 6G runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 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.