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 can deviate, for example, the latest CPUs have the property of reducing the clock rate when there is a threat of overheating. This leads to a different result when measuring the frequency. It is the same with mobile devices, tablets, MS Surface, laptops, ... these can also reduce the maximum CPU frequency in battery mode in order to save the battery and thus achieve a longer runtime in battery mode!
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
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