Most users probably won't care about the frequency of the CPU and the like, but there are a few tech enthusiasts who are interested in the operating system and how it works. Here are a few more links related to Frequency CPU and the like that will give you more information or where you can learn something new.
If the CPU frequency is not always the same, it can have different causes, it does not have to be a faulty / defective CPU The processor / CPU frequency
After the various update to eg 1607 the processor does not seem to be down-clocking anymore. For notebook and Surface Pro or GO it is partly connected to
From version 2.11 a better recognition of some CPUs and the manufacturer as well as series is available above all with Intel processors This screenshot
It is quite easy to solve the problems with the installation of the CPU query tool for MS Windows 11, 10, , whether on desktop or server operating systems
If the CPU frequency is not always the same, it can have different causes, it does not have to be a faulty / defective CPU The processor / CPU frequency