Asus Maximus V Extreme User Manual page 136

Profile Mode
Allows you to set the optional fans' profiles.
Configuration options: [Performance] [Optional] [Silent]
User Mode
Allows you to set the optional fan's speed temperature.
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OPT1-3 Low Speed Temp [25%]
Allows you to set the optional fans' low speed temperature.
Configuration options: [25%] [30%] [35%] [40%]
OPT1-3 Full Speed Temp [60%]
Allows you to set the optional fans' full speed temperature.
Configuration options: [60%] [70%] [80%] [90%]
Chapter 3: BIOS setup