Asus A55M-A Series User Manual page 59

CPB Mode [Auto]
Disables the CPB (Core Performance Boost) mode or set it to [Auto] for automatic
configuration. Configuration options: [Disabled] [Auto]
C6 Mode [Enabled]
Enables or disables C6 mode. Configuration options: [Enabled] [Disabled]
IOMMU [Disabled]
Set this item to [Enabled] to show IOMMU Mode. Configuration options: [Enabled] [Disabled]
Bank Interleaving [Enabled]
Enables or disables Bank Interleaving. Configuration options: [Enabled] [Disabled]
Channel Interleaving [Enabled]
Enables or disables Channel Interleaving. Configuration options: [Enabled] [Disabled]
Core Leveling Mode [Automatic mode]
Adjust ratio of number of cores per processor or per compute unit Configuration options:
[Automatic mode] [One core per processor] [One Compute Unit] [One core per Compute Unit]
Chapter 2: BIOS information 2-17