Asus X99-M WS Manual page 100

Turbo Mode [Enabled]
This item allows you to automatically set the CPU cores to run faster than the base
operating frequency when it is below the operating power, current and temperature
specification limit.
Configuration options: [Enabled] [Disabled]
CPU states [Auto]
This item allows you to set the power saving of the CPU states.
Configuration options: [Auto] [Disabled] [Enabled]
The following items appear only when you set the CPU states to [Enabled].
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Enhanced C1 state [Enabled]
This item allows your CPU to reduce power consumption when the system
is in idle mode.
Configuration options: [Enabled] [Disabled]
CPU C3 Report [Disabled]
This item allows you to disable or enable the CPU C3 report to the
operating system.
Configuration options: [Enabled] [Disabled]
CPU C6 Report [Enabled]
This item allows you to disable or enable the CPU C6 report to the
operating system.
Configuration options: [Enabled] [Disabled]
Package C State limit [Auto]
This item allows you to set the a C-state support for the CPU package.
Configuration options: [Auto] [C0/C1 state] [C2 state] [C6 (non Retention)
state] [C6 (Retention) state]
Chapter 3: BIOS setup