Asus Maximus VI Extreme Manual page 120

CPU C States [Auto]
Allows you to enable or disable the CPU C states.
Configuration options: [Auto] [Enabled] [Disabled]
The following items appear only when you set the CPU C States to [Enabled].
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Enhanced C1 state [Enabled]
Allows your processor to reduce power when the system is in idle mode.
Configuration options: [Enabled] [Disabled]
CPU C3 Report [Enabled]
Allows you to disable or enable the CPU C3 report to the operating system.
Configuration options: [Enabled] [Disabled]
CPU C6 Report [Disabled]
Allows you to disable or enable the CPU C6 report to the operating system.
Configuration options: [Enabled] [Disabled]
C6 Latency [Short]
Allows you to configure the Short/Long latency for C6.
Configuration options: [Short] [Long]
CPU C7 Report [Disabled]
Allows you to disable or enable the CPU C7 report to the operating system.
Configuration options: [Enabled] [Disabled]
C7 Latency [Long]
Allows you to configure the Short/Long latency for C7.
Configuration options: [Short] [Long]
Package C State Support [C0/C1]
Allows you to set the C-state according to the following configuration
options: [Auto] [Enabled] [C0/C1] [C2] [C3] [C6] [CPU C7] [CPU C7s]
Chapter 3: BIOS setup