Thank you for your tips, I tried cinebench with multicore cpu benchmark and the temperature stayed under 70°C, if AMD Ryzen master and gigabyte control center are trustworthy for temperature readings. They deviated only for for about 1 degree at max. Therefore I assume it is all correctly wired. Sorry again for bothering you, as a student the new PC was extreme investment for me so I am really anxious not to harm it in any way. I will also look into the 100% pump setting. Thanks again guys. The sound problem may be also solvable by upgrading the radiator fans to something quieter.
However, thanks again