Help me to build a casual workstation and gaming PC in New Builds and Planning Posted October 4, 2020 57 minutes ago, Mateyyy said: Have you plugged the fan on your NH-D15 in the CPU_FAN header on the motherboard? Go into the fan control tab in the BIOS (it'll probably be called something like Fan Xpert 4), and set your fans to PWM control. Then you should be able to do custom fan curves either in there, or in Windows through AI Suite. Thanks for the tip. I accidentally I connected the 140mm fan to the AiO water-cooling set header. I moved it to the secondary optional cpu header and it's perfect now. Multumesc Mateyyy. One more month until my GPU!