AMD GA-M51GM-S2G - Manual (Page 45)

BIOS Setup - 45 -
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CPU Smart FAN Mode
This option is available only when CPU Smart FAN Control is enabled.
Auto BIOS autodetects the type of CPU fan you installed and sets the optimal CPU
Smart FAN control mode for it. (Default Value)
Voltage Set to Voltage when you use a CPU fan with a 3-pin fan power cable.
PWM Set to PWM when you use a CPU fan with a 4-pin fan power cable.
System Smart FAN Control
Disabled Disable this function. (Default value)
Enabled When this function is enabled, system fan will run at different speed depend-
ing on system temperature. Users can adjust the fan speed with Easy Tune
based on their requirements.
(Note) Whether the CPU Smart FAN Control function is supported will depend on the CPU you install.