Comparison of ZOTAC GeForce GTX 1070 Ti OEM video card vs KFA2 GeForce GTX 1080 Ti video card by specifications and benchmarks. ZOTAC GeForce GTX 1070 Ti OEM runs at 1.607 GHz base clock speed and has 8 GB of GDDR5 memory, while video card KFA2 GeForce GTX 1080 Ti runs at 1.480 GHz base clock speed and has 11 GB of GDDR5X memory. The TDP of the first video card is 180 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.