Asus MAXIMUS IX HERO Bios Manual page 59

Extension Fan 1-3 Fan Speed Low Limit
This item allows you to disable or set the extension fan warning speed.
Configuration options: [Ignore] [200 RPM] [300 RPM] [400 RPM] [500 RPM] [600 RPM]
Extension Fan 1-3 Profile
This item allows you to set the appropriate performance level of the extension fan.
[Standard]
[Silent]
[Turbo]
[Manual]
The following items appear only when you set the Extension Fan Profile to [Manual].
Extension Fan 1-3 Upper Temperature
Use the <+> or <-> keys to adjust the upper limit of the extension fan
temperature. The extension fan will operate at the maximum duty cycle
when the temperature source is higher than the limit.
Extension Fan 1-3 Max. Duty Cycle (%)
Use the <+> or <-> keys to adjust the maximum extension fan duty cycle.
When the temperature source reaches the upper limit, the extension fan
will operate at the maximum duty cycle.
Extension Fan 1-3 Middle Temperature
Use the <+> or <-> keys to adjust the middle limit of the extension fan
temperature.
Extension Fan 1-3 Middle. Duty Cycle (%)
Use the <+> or <-> keys to adjust the extension fan middle duty cycle.
Extension Fan 1-3 Lower Temperature
Use the <+> or <-> keys to adjust the lower limit of the extension fan
temperature. The extension fan will operate at the minimum duty cycle
when the temperature source is lower than the limit.
Extension Fan 1-3 Min. Duty Cycle(%)
Use the <+> or <-> keys to adjust the minimum extension fan duty cycle.
When the temperature source is under the limit, the extension fan will
operate at the minimum duty cycle.
Allow Fan Stop
This item allows your fans to run at 0% duty cycle when the temperature of
the source drops below the lower temperature.
Configuration options: [Disabled] [Enabled]
ASUS MAXIMUS IX HERO BIOS Manual
Set to make the extension fan adjust automatically depending on the
CPU temperature.
Set to minimize the fan speed for quiet extension fan operation.
Set to achieve maximum extension fan speed.
Set to assign the detailed fan speed control parameters.
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