Asus CROSSHAIR IV FORMULA User Guide - Page 110

CPU Q-Fan Mode [Silent] [Performance] Sets to [Performance] to achieve maximum CPU fan speed. [Optimal] S ets to [Optimal] to make the CPU fan automatically adjust depending on the CPU temperature. [Silent] S ets to [Silent] to minimize the fan speed for quiet CPU fan operation.] [Manual] Sets to [Manual] to assign detailed fan speed control parameters. Chassis Q-Fan Function [Disabled] Allows you to enable or disable the Chassis fan controller. [Disabled] Disables the Chassis Q-fan controller. [Enabled] Enables the Chassis Q-fan controller. 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] S ets to [Optimal] to make the Chassis fan automatically adjust depending on the Chassis temperature. [Silent] S ets to [Silent] to minimize the fan speed for quiet Chassis fan operation.] [Manual] Sets to [Manual] to assign detailed fan speed control parameters. 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] 3-34 Chapter 3: BIOS setup