MSI Z170-A PRO User Manual - Page 34
CPUFAN1~2, SYSFAN1~3: Fan Connectors, Controlling the fan speed
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CPUFAN1~2, SYSFAN1~3: Fan Connectors Fan connectors can be classified as PWM (Pulse Width Modulation) Mode and Voltage Mode. PWM Mode fan connectors provide constant 12V output and adjust fan speed with speed control signal. Voltage Mode fan connectors control fan speed by changing voltage. Therefore, when you plug a 3-pin (Non-PWM) fan to a PWM Mode fan connector, the fan speed will be always maintained at 100%, and that could be noisy. PWM Mode fan connector 1 CPUFAN1 1 Ground 3 Sense 1 CPUFAN2 2 +12V 4 Speed Control Signal Voltage Mode fan connector 1 SYSFAN1/ SYSFAN3 1 Ground 2 3 Sense 1 SYSFAN2 Voltage Control Controlling the fan speed There are two ways to manage fan speed. One is to go to BIOS > HARDWARE MONITOR. The other is to use COMMAND CENTER application. BIOS > HARDWARE MONITOR COMMAND CENTER Both methods offer gradient points of the fan speed that allow you to adjust fan speed in relation to CPU temperature. 34 Overview of Components