So, I "just" need to change the voltage for the fans on my motherboard (that has +5V as default settings), but I don't find where to do it.
I tried the settings in the BIOS and using the tool "Fan Xpert 2", that comes with the "AI Suit III" in the motherboard disc, but it doesn't have (or I didn't find) a place to change the voltage. It is only possible to change the RPM.
I changed the settings in the BIOS, CPU_Q from default (to work with 4 pins coolers) to advanced (to work with 3 pins coolers) and the noise dissapeared. However, as soon as the windows starts, the cooler stops.