Asus Maximus VII Ranger - 3.8 Boot menu

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Chapter 3: BIOS setup
Chapter 3
Chassis Fan 1/2/3 Lower Temperature [40]
Displays the lower limit of the CPU temperature.
Chassis Fan 1/2/3 Min. Duty Cycle(%) [60]
Use the <+> or <-> keys to adjust the minimum CPU fan duty cycle. The
values range from 0% to 100%. When the CPU temperature is under 40ºC,
the CPU fan will operate at the minimum duty cycle.
Use the <+> and <-> keys to adjust the minimum chassis fan duty cycle.
The values range from 60% to 100%. When the chassis temperature is
under 40ºC, the chassis fan will operate at the minimum duty cycle.
Allow Fan Stop [Disabled]
This function allows the fan to run at 0% duty cycle when the temperature of the source is
dropped below the lower temperature. Conguration options. [Disabled] [Enabled]
3.8 Boot menu
The Boot menu items allow you to change the system boot options.
Scroll down to display the other BIOS items.