Overclocking on the Intel Z370 platform is pretty easy. The easiest way to overclock would be up simply change the frequency divider in the BIOS. To achieve the best overclock we try to stay with the timings that the XMP profile recommends. If we run into any issues we will bump up the voltage to see if we can get our system to boot and become stable.
The XMP profile puts this kit at 2666 MHz. In the BIOS I started moving up the frequency divider without changing the timings or voltage. We made it up to 2933 MHz no problem at all! Completely stable with no adjustments to voltage or timings!
After we went above 2933 MHz the system became a little unstable so we decided to up the voltage a bit. We ended up with a final stable overclock of 3200 MHz with the voltage at 1.35V and the timings completely the same at 16-18-18-38.