Comparison of GIGABYTE GeForce GTX 1060 D5 3G video card vs Gainward GeForce GTX 1660 TI Pegasus OC video card by specs and benchmarks. GIGABYTE GeForce GTX 1060 D5 3G runs at 1.506 GHz base clock speed and has 3 GB of GDDR5 memory, while video card Gainward GeForce GTX 1660 TI Pegasus OC runs at 1.506 GHz base clock speed and has 6 GB of GDDR6 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.