Asus P7F-C/SAS - Manual (Page 75)

ASUS P7F-C Series 4-19
C State package limit setting [Auto]
We recommend that you set this item to [Auto] for BIOS to automatically detect the
C-State mode supported by your CPU.
Configuration options: [Auto] [C1] [C3] [C6]
C1 Auto Demotion [Enabled]
When this item is enabled, the CPU will conditionally demote C3/C6/C7 requests to
C1 based on the uncore auto-demote information.
Configuration options: [Disabled] [Enabled]
C3 Auto Demotion [Enabled]
When this item is enabled, the CPU will conditionally demote C6/C7 requests to C3
based on the uncore auto-demote information.
Configuration options: [Disabled] [Enabled]