I just bult my first "Super PC"... and for CPU Cooling I used a Corsair iCUE H150i RGB PRO XT.
This Cooler cames with:
x1 iCUE USB Cable - Just connected it on the Motherboard
x1 SATA Connector - Connected it on the PSU SATA Cable
x1 a Cable with 3 pins and only one wire - Connected on CPU_FAN (Motherboard).
But there are 3 connectors (labeled as 1, 2 and 3 - as shown in the images attached), which I can't figure out where to connect them. Right now, the PC is working without these cables connected and I am worried if I am doing it right.