Symptoms
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.
Workaround
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:
Physical/Logical CPU Frequency Reporting with Hyper-V enabled
Status
This is a known issue in the product versions that are listed in the "Applies to" section.
