Asus CROSSHAIR IV EXTREME User Manual page 110

CPU Q-Fan Mode [Silent]
[Performance] Sets to [Performance] to achieve maximum CPU fan speed.
[Optimal]
[Silent]
[Manual]
Chassis Q-Fan Function [Disabled]
Allows you to enable or disable the Chassis fan controller.
[Disabled]
[Enabled]
The following items appear only when you set Chassis Q-Fan Function to
[Enabled].
Chassis Fan Speed Low Limit [200 RPM]
A warning message will appear to remind you that the CPU fan speed is lower than
the selected value.
Configuration options: [500RPM] [400RPM] [300RPM] [200RPM] [100RPM]
[Ignored]
Chassis Q-Fan Mode [Silent]
[Performance] Sets to [Performance] to achieve maximum Chassis fan speed.
[Optimal]
[Silent]
[Manual]
Power Fan Control [Disabled]
Allows you to select the power fan control mode. When this item is set to
[Duty Mode], you can configure the Power Fan Duty item.
Power Fan Duty [50%]
Allows you to set the fan duty cycle.
Configuration options: [40%] [50%] [60%] [70%] [80%] [90%]
OPT Fan 1/2/3 Control [Disabled]
Allows you to select the optional fan control mode. When this item is set to
[Duty Mode], you can configure the OPT Fan 1/2/3 Duty item. If you set this
item to [User Mode], you are allowed to configure the OPT Fan 1/2/3 Low
Speed Temp and OPT Fan 1/2/3 Full Speed Temp item.
Configuration options: [Disabled] [Duty Mode] [User Mode]
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Sets to [Optimal] to make the CPU fan automatically adjust
depending on the CPU temperature.
Sets to [Silent] to minimize the fan speed for quiet CPU fan
operation.]
Sets to [Manual] to assign detailed fan speed control parameters.
Disables the Chassis Q-fan controller.
Enables the Chassis Q-fan controller.
Sets to [Optimal] to make the Chassis fan automatically adjust
depending on the Chassis temperature.
Sets to [Silent] to minimize the fan speed for quiet Chassis fan
operation.]
Sets to [Manual] to assign detailed fan speed control parameters.
Chapter 3: BIOS setup