These are the CPU settings. You might also try AMD Overdrive software and reading the AMD Overdrive guide.
CPU Unlock (Note)
Allows you to determine whether unlock hidden CPU cores. (Default: Disabled)
Note) This item is present only when you install a CPU that supports this feature
CPU core Control (Note)
Allows you to determine whether to manually enable/disable CPU Core.
[Auto] Lets the BIOS to enable all CPU cores (number of cores available depends on the CPU
being used). (Default)
[Manual] Allows you to individually enable/disable CPU Core.
CPU core 0 (Note)
This setting is fixed. CPU Core 0 is always enabled.
CPU core 1, 2/3(Note)
Enables or disables CPU Core 1/2/3. (Default: Enabled)
(Note) This item is present only when you install a CPU that supports this feature.