Asus Crosshair V Formula/ThunderBolt - Manual (Page 116)

3-32 Chapter 3: BIOS setup
Chassis.Fan.Min..Duty.Cycle(%).[60]
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.
Chassis.Fan.Speed.Low.Limit.[600.RPM]
This item appears only when you enable the Chassis Q-Fan Control feature and
allows you to disable or set the chassis fan warning speed.
Configuration options: [Ignore] [100 RPM] [200 RPM] [300 RPM] [400 RPM] [500
RPM] [600 RPM]
OPTFAN.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.Fan1/2/3.Duty item. If you set this item to [User
Mode], you are allowed to configure the OPT.Fan1/2/3.Low.Speed.Temp and
OPT.Fan1/2/3.Full.Speed.Temp item.
Configuration options: [Disabled] [Duty Mode] [User Mode]
OPTFAN 1/2/3 Low Speed Temp [25˚C]
Allows you to set the temperature at which the power fan rotates at low speed.
This item appears when the OPTFAN1/2/3 Control item is set to [User Mode].
Configuration options: [25˚C] [30˚C] [35˚C] [40˚C]
OPTFAN 1/2/3 Full Speed Temp [60˚C]
Allows you to set the temperature at which the power fan rotates at full speed.
This item appears when the OPTFAN1/2/3 Control item is set to [User Mode].
Configuration options: [60˚C] [70˚C] [80˚C] [90˚C]