Asus Maximus IV Extreme - Manual (Page 126)

3-34 Chapter 3: BIOS setup
PWRFAN Duty; OPTFAN 1/2/3 Duty [60%] OPTFAN 1/2/3 Duty [60%]
Allows you to set the fan duty cycle. This item appears when the PWRFAN Control
or OPTFAN1/2/3 Control item is set to [Duty Mode].
Configuration options: [40%] [50%] [60%] [70%] [80%] [90%]
OPTFAN �/2/� Low Speed Temp [2�˚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 �/2/� Full Speed Temp [��˚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]