Comparison of ZOTAC GAMING GeForce GTX 1660 6GB GDDR5 video card vs ZOTAC GeForce GTX 960 Reference video card by specs and benchmarks. ZOTAC GAMING GeForce GTX 1660 6GB GDDR5 runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory, while video card ZOTAC GeForce GTX 960 Reference 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.