The Turbo Boost feature was designed by Intel to be used all the time. Whether your CPU is running a single threaded application or your CPU is running fully loaded, an Intel® Core™ i5-5250U Processor will be using as much Turbo Boost as possible. If the CPU exceeds the TDP limit, the amount of Turbo Boost is reduced but it is still using as much Turbo Boost as possible.
The Turbo Boost is set up automatically in your system and the behavior you’re seeing there it is totally normal, the Turbo Boost will stay at the range of 1.6 GHz and 2.7 GHz.
Due to varying power characteristics, some parts with Intel® Turbo Boost Technology 2.0 may not achieve maximum turbo frequencies when running heavy workloads and using multiple cores concurrently.
You can also run the Intel® Processor Diagnostic Tool
The purpose of the Intel Processor Diagnostic Tool is to verify the functionality of an Intel® processor. The diagnostic checks for brand identification, verifies the processor operating frequency, tests specific processor features and performs a stress test on the processor.
Could you please run the Intel® Processor Diagnostic Tool? You can download it from the link provided above.
Once you run it, please reply with the result, at the top of the Window is a Menu Bar. The File Menu allows you to open the TestResults.txt file using Notepad, and allows you to exit IPDT. See below
I will apreciate if you could attach the results on this thread.