Intel GA-8N-SLI ROYAL, GA-8N-SLI PRO user manual CPU Smart FAN Control, CPU Smart FAN Mode, Pwm

CPU Smart FAN Control

Disabled	Disable this function.
Enabled	When this function is enabled, CPU fan will run at different speed depending on
	CPU temperature. Users can adjust the fan speed with Easy Tune based on
	their requirements. (Default value)

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.

In fact, the Voltage option can be used for CPU fans with 3-pin or 4-pin power cables. However, some 4-pin CPU fan power cables are not designed following Intel 4-wire fans PWM control specifications. With such CPU fans, selecting PWM will not effectively reduce the fan speed.

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- 49 - BIOS Setup