Windows Task Manager shows incorrect CPU speed when Hyper-V is enabled

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 Datacenter


If the Hyper-V role is enabled in any of the products that are listed in the "Applies to"section, the CPU Frequency speed value that is displayed in Task Manager is not the current speed, as expected. When the Hyper-V Role is not enabled, Task Manager correctly displays the current speed for this value.


To work around this issue, use the built-in Performance Monitor tool (perfmon.exe), and add the "\Hyper-V Hypervisor Logical Processor\Frequency" performance counter.

More Information

For a more detailed discussion of this issue, see the following MSDN blog article:


This is a known issue in the product versions that are listed in the "Applies to" section.