Comparison of ZOTAC GeForce GTX 1070 Twin Fan video card vs GIGABYTE GeForce GTX 1660 GAMING OC 6G video card by specifications and benchmarks. ZOTAC GeForce GTX 1070 Twin Fan runs at 1.506 GHz base clock speed and has 8 GB of GDDR5 memory, while video card GIGABYTE GeForce GTX 1660 GAMING OC 6G runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory. The TDP of the first video card is 220 W+ 47 %, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.