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Hello Daneel3001, first of all it is very important to understand that in order to reach 2.6 GHz you need to have Intel® Turbo boost technology enabled on BIOS. Usually this feature comes enabled by default.
In addition to that, Intel® Turbo boost is engaged automatically depending on processor’s load, voltage, power and temperature. Therefore the processor may reach 2.6 GHz, only when it is needed.
Something very important is that only 1 core will be capable to reach that speed.
I would recommend you to test the NUC using only 1 memory stick and check the performance of the device. Also, remember that memory needs to be 1.35V.
There is a utility named Processor Diagnostics Tool that you may want to try to install. This tool will verify the functionality of your processor. https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&keyword=Processor%20Diagnostics%20Tool
There is third party software that you may also want to try named CPU-Z.
Please reply with the event logs you are getting.
The kind of event I get is as follow:
The speed of processor 0 in group 0 is being limited by system firmware. The processor has been in this reduced performance state for 86399 seconds since the last report.
I will get 4 of these in quick succession for each of the 4 cores.
I haven't checked but I'm pretty sure Intel Turbo Boost is enabled in the BIOS.