Disclaimer: Overclocking is never guaranteed, so the results may vary depending on certain conditions and various hardware configurations. I am not recommending overclocking if you do not know what are you doing. High voltages may damage your hardware and it will not be covered by warranty.
For CPU overclocking, the BIOS was very easy to use and I managed to overclock our Core i7-8700K from the default speed of 3.7 GHz to a respectable 5.0GHz with good stability.
I set the CPU ratio to 50 for all cores (fixed mode) and increase the CPU voltage to 1.35V. All opther settings were untouched and left on AUTO.
DDR4 ram @ 4300 MHz
I tested the motherboard with a pair of TeamGroup T-Force XCalibur RGB DDR4-4000 16Gb kit, and it ran perfectly with XMP 2.0 profiles enabled. I was even able to overclock the ram further to 4300 MHz.