Asus RAMPAGE IV BLACK EDITION - Manual (Page 160)

4-14 Chapter 4: Software support
Chapter 4
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CPU Voltage Frequency
CPU Voltage Frequency affects the VRM transient response and thermal
conditions. Higher VRM frequency gets a quicker transient response.
When Auto is selected, you have an option to enable CPU Spread Spectrum that
helps enhance system stability.
When CPU Fixed Frequency is selected, you can assign a CPU frequency to
increase the overclocking range. .
VRM Over Temperature Protection
VRM Over Temperature Protection protects the motherboard from overheating.
It is recommended to set VRM Over Temperature Protection to [Auto].
CPU Power Duty Control
CPU Power Duty Control adjusts the current of every VRM phase and the thermal
conditions of every phase component.