Asus Maximus II Formula - Manual (Page 87)

ASUS Maximus II Formula 3-19
The following items appear only when you set the CPU Ratio Control item to
[Auto].
Intel(R) SpeedStep (TM) Tech [Enabled]
When set to [Disabled], the CPU runs at its default speed. When set to
[Enabled], the CPU speed is controlled by the operating system.
Configuration options: [Disabled] [Enabled]
Intel(R) C-STATE Tech [Enabled]
Allows you enable or disable the Intel ® C-STATE Technology. When enabled,
the CPU idle is set to C2/C3/C4. Configuration options: [Disabled] [Enabled]
CPU Spread Spectrum [Auto]
Set to [Disabled] to enhance FSB overclocking ability or [Auto] for EMI control.
Configuration options: [Auto] [Disabled]
PCIE Spread Spectrum [Auto]
Set to [Disabled] to enhance PCIE overclocking ability or [Auto] for EMI control.
Configuration options: [Auto] [Disabled]