Question We have a X9SCL-F and connected Chassis fans to FAN-1/2/3 and CPU fan to fan header "A" on this mainboard. Now we see that the fan spin up/down, or sometimes full speed. What can we do? Answer FANA is for add-on card and controlled by system temperature. FAN1~4 is controlled by CPU temperature. CPU Heatsink fan should not be connected to FAN-A. CPU Heatsink fan can be connected to FAN-1. Chassis fans can be connected to FAN-2~4 or FAN-A. Was this FAQ helpful? YES      NO Enter Comments Below: Note: Your comments/feedback should be limited to this FAQ only. For technical support, please send an email to support@supermicro.com.  Enter your email address below if you'd like technical support staff to reply:  Please type the Captcha (no space) 7 V M K FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 13433 Hardware Monitoring: - Cooling Other: - Assemble - Support Information Peripherals: - Cooling Fans 01/12/12 PD     Print Answer