Comparison of GIGABYTE GeForce GTX 1660 D5 6G video card vs Gainward GeForce GTX 960 OC video card by specs and benchmarks. GIGABYTE GeForce GTX 1660 D5 6G runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory, while video card Gainward GeForce GTX 960 OC runs at 1.530 GHz base clock speed and has 2 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.