[Lsdmeasap]

Do you have the correct BIOS settings enabled for fan control? Not sure what they are in Asus BIOS, hopefully someone will chime in who knows. But your manual should tell you as well if you have it

Does it not spin at all even if you put it on full load, I mean load the system with prime or orthos or something? If you are using PWM control or similar the Board may tell the fan to not run if temp is under a certain temp. So you may want to set Voltage in your BIOS instead of PWM or system controlled? Again though, not sure for your board or that cooler