CPU frequencies shown in System property page do not match

Applies to: Windows Server, version 1903Windows 10, version 1903Windows Server 2019, all versions

Symptoms


Consider the following scenario:
  • You have a Windows computer with multiple Intel processors.
  • You open the System property page.
  • Under the Processor section, the CPU name is shown and two identical frequencies are listed. For example,  <CPU Name> @ 2.00GHz 2.00GHz.
  • You then install the Intel Collaborative Processor Performance Control (CPPC) driver, which provides additional power management and increases battery life.
After the Intel CPPC driver is installed, the second CPU frequency listed in the System properties page does not match the first one.

Cause


The first frequency that is listed for the processor is fixed and part of the name of the processor. The second frequency is normally computed by Windows using P-states or the frequency of the time stamp counter. However, when the Intel CPPC driver is installed, the system uses CPPC to manage the frequency of the processor and not P-states. As a result, Windows uses the time stamp counter frequency to determine processor frequency. On systems with Intel-based processors that support configurable thermal design power (TDP), this may result in the second frequency listed being different from the first.


Resolution


This is a cosmetic issue and does not affect how Windows manages the processor frequencies. Windows is aware of the processor frequency at any given point in time and will manage it accordingly.

More Information


For more information on Intel's Collaborative Processor Performance Control (CPPC) feature, P-states and thermal design power (TDP), visit the following links on Intel's website:

Mobile 4th Generation Intel® Core™ Processor Family: Product Brief
http://www.intel.com/content/www/us/en/processors/core/4th-gen-core-family-mobile-brief.html?wapkw=%22collaborative+processor+performance+control%22

What exactly is a P-state? (Pt. 1)
http://software.intel.com/en-us/blogs/2008/05/29/what-exactly-is-a-p-state-pt-1/

Measuring Processor Power
http://www.intel.com/content/dam/doc/white-paper/resources-xeon-measuring-processor-power-paper.pdf