OCC published GTX 1070 Ti Overclocking Guide
A quote from the article:
GTX 1070 Ti Overclocking Guide
After you have mastered the basics of overclocking, there are a few tricks left to try for squeezing every last megahertz from that video card. As explained at the beginning of this guide, NVIDIA has provided the ability to break the traditional linear voltage to clocked speed ratio and allows for a non-linear approach. When you move the core clock slider with any overclocking software, it is automatically creating a voltage curve to reflect those settings. If you want to manually fine-tune those settings or create your own non-linear curve the option is available. Although not all the overclocking software provides the options to use a custom curve profile, both MSI and EVGA do include it.
GTX 1070 Ti Overclocking Guide