Asus SABERTOOTH 990FX/GEN3 R2.0 - Manual (Page 100)

3-30 Chapter 3: BIOS setup
Chapter 3
Chassis Fan 1/4 Profile [Standard]
This item appears only when you enable the Chassis Q-Fan Control feature and allows
you to set the appropriate performance level of the chassis fan.
[Standard] Sets to [Standard] to make the chassis fan automatically adjust
depending on the chassis temperature.
[Silent] Sets to [Silent] to minimize the fan speed for quiet chassis fan
operation.
[Turbo] Sets to [Turbo] to achieve maximum chassis fan speed.
[Manual] Sets to [Manual] to assign detailed fan speed control parameters.
The following four items appear only when you set Chassis Fan Profile to [Manual].
Chassis Upper Temperature [70]
Use the <+> and <-> keys to adjust the upper limit of the CPU temperature.
The values range from 40ºC to 90ºC.
Chassis Lower Temperature [40]
Displays the lower limit of the chassis temperature.
Chassis Fan Max. Duty Cycle(%) [60]
Use the <+> and <-> keys to adjust the maximum chassis fan duty cycle.
The values range from 20% to 100%. When the chassis temperature
reaches the upper limit, the chassis fan will operate at the maximum duty
cycle.
CPU Fan Min. Duty Cycle(%) [60]
Use the <+> and <-> keys to adjust the minimum chassis fan duty cycle.
The values range from 0% to 100%. When the chassis temperature is
under 40ºC, the chassis fan will operate at the minimum duty cycle.