Comparison of ZOTAC GeForce GTX 1060 6GB GDDR5X video card vs Gainward GeForce GTX 1660 Pegasus OC video card by specs and benchmarks. ZOTAC GeForce GTX 1060 6GB GDDR5X runs at 1.506 GHz base clock speed and has 6 GB of GDDR5X memory, while video card Gainward GeForce GTX 1660 Pegasus OC runs at 1.506 GHz base clock speed and has 6 GB of GDDR5 memory. The weight is different, -- vs --. The TDP of the first video card is 120 W, and the second is 120 W . Compare the benchmark results to find out which video card is better.