Comparison of ZOTAC GeForce GTX 1080 AMP Edition video card vs Gainward GeForce GTX 1660 Pegasus OC video card by specifications and benchmarks. ZOTAC GeForce GTX 1080 AMP Edition runs at 1.683 GHz+ 5 % base clock speed and has 8 GB of GDDR5X memory, while video card Gainward GeForce GTX 1660 Pegasus OC 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+ 28 %, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.