System Configuration reports an incorrect number of processors for some multiple-core computers

Applies to: Windows 10

Symptoms


On a computer that has 32 or more hyperthreaded processor cores, you use the Windows System Configuration tool (MSConfig) to set the number of logical processors that Windows can use. However, the Number of processors list does not show the correct number of logical processors.

Cause


This is a known issue in Windows 10.

Workaround


To change the number of logical processors that Windows can use, use the BCDEdit tool instead of MSConfig. For more information about BCDEdit, see bcdedit.

To use BCDEdit, open a Command Prompt window as an administrator.

To remove the previous setting for the number of processors, run the following command:

bcdedit /deletevalue numproc

To set the number of processors, run the following command:

bcdedit /set numproc <number>

To view the number of processors that are in use, open Task Manager, select Performance, and then select CPU.