Asus CROSSHAIR IV EXTREME User Manual page 70

5. Core Unlocker switch
This switch allows you to unlock the extra cores of your CPU.
For ensuring the system performance, turn the switch setting to Enable when
the system is powered off.
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You may also press <4> during the Power-On-Self-Test (POST) or enable
the ASUS Core Unlocker item in the BIOS menu to activate the Core
Unlocker function.
The system will use the last setting you have made.
If you clear the CMOS or load the BIOS setup defaults, the ASUS Core
Unlocker item in the BIOS menu follows the current setting of the Core
Unlocker switch.
Chapter 2: Hardware information