I can tell you about our software Intel® Extreme Tuning Utility. The tool shows graphically the options available in the BIOS to over clock the system plus it lets us run a stress test.
I noted you are running Windows® 7. It is necessary to download and run the “KMDF 1.11 update for Win7" file before installing Intel® XTU.
It is necessary to have the latest chipset and Management Engine drivers in the NUC.
The latest version of Intel® XTU is 220.127.116.11
not sure what makes you think I am running win 7- I am using the win 7 backup that comes with windows 10 because the file history function doesn't provide real backup - at least for what I want to do, but maybe its UI is just not well architected - not your problem though. but given that I am running windows 10, can you please respond to my original question?
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Intel® Extreme Tuning Utility is showing you the processor frequency (Processor Cache frequency: 2.69GHz) and it is showing you the speed of one of the Cores: 2.78GHz.
Also, Task Manager is giving you the processor speed at 2.70GHz. Both applications are giving almost the same results.
Now, in regards the cpu utilization, it seems the Extreme Tuning Utility is not giving you the right information.
Please update the BIOS to the latest version 0039, Chipset and Management Engine drivers. It is necessary to unzip the .BIO file first. Then, double check the results of iXTU.