Comparison of ZOTAC GeForce GTX 1070 Twin Fan video card vs Gainward GeForce GTX 1080 Ti Phoenix GS 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 Gainward GeForce GTX 1080 Ti Phoenix GS runs at 1.556 GHz+ 5 % base clock speed and has 11 GB of GDDR5X memory. The TDP of the first video card is 220 W+ 47 %, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.