Overclocking on the Intel Z270 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, but we will loosen or tighten timings depending on how things go.
The XMP profile puts this kit at 3200 MHz. In the BIOS I started moving up the frequency divider. Naturally the first time up from 3200 MHz is 3333 MHz. Without having to adjust timings or voltage I was able to run the memory at 3333 MHz! That is quite impressive as once you get over 3000 MHz with DDR4 getting a kit to go over its XMP profile typically requires a voltage bump or loosening the timings.
Naturally I wanted to take this kit even further so the next step was 3466 MHz. Once again I just changed the frequency in the BIOS. To my surprise our system booted up no problem. Running through our stability test things were just fine!
Now I tried to go higher, even upping the voltage to 1.40V, but the kit did not want to go any higher. It is still extremely impressive to get up to 3466 MHz without having to adjust voltage or timings!