Comparison of Gainward GeForce GTX 1070 Ti Phoenix GS video card vs ZOTAC GeForce GTX 1080 AMP Extreme video card by specifications and benchmarks. Gainward GeForce GTX 1070 Ti Phoenix GS runs at 1.708 GHz+ 6 % base clock speed and has 8 GB of GDDR5 memory, while video card ZOTAC GeForce GTX 1080 AMP Extreme runs at 1.771 GHz+ 10 % base clock speed and has 8 GB of GDDR5X memory. The TDP of the first video card is 180 W, and the second is 270 W+ 50 %. Compare the table of benchmark results to find out which graphic card is better.