Gigabyte GA-M61PME-S2 User Manual page 44

CPU Smart FAN Mode
Specifies how to control CPU fan speed. This item is configurable only if CPU Smart FAN
Control is set to Enabled.
Auto
Voltage
PWM
GA-M61PME-S2 Motherboard
Lets BIOS autodetect the type of CPU fan installed and sets the optimal CPU
fan control mode. (Default)
Sets Voltage mode for a 3-pin CPU fan.
Sets PWM mode for a 4-pin CPU fan.
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