Hello,
Let's start with the relevant parts in my PC. (Actually maybe CPU is relevant as well, it's a ryzen 5 1600) https://pcpartpicker.com/list/jQF2M8
I checked in the BIOS and saw that my RAM is set to run on 2133MHz, so I wanted to change it (as I paid for 2666MHz). What I did was go into the BIOS -> Advanced Mode -> AI tweaker and set 'Ai overclock tuner' from 'auto' to 'D.O.C.P.'. When I try to boot it fails a few times (screen has no input), then it says something along the lines of 'overclock failed'.
Also, since it said 'overclock failed', I was wondering. Does this count as overclocking? Because it's not right? I don't want to lose warranty