You can try by disabling "Enhanced Intel SpeedStep® Technology" on BIOS.
In order to get to that speed, it will be necessary to make some changes on BIOS such as Memory SPD and Core Ratio, but we do not support these settings.
Sylvia_intel, you are saying the 2.13 GHZ is the maximum clock speed Intel supports with this kit?
So the technical spec sheet is saying the 2820 chip supports a 2.4 ghz clock, but only in a different configuration? I assume the chip is being underclocked for better cooling or stability?
That is correct. In addition to that, we do not recommend over clocking any internal component. There is no warranty support for that practice.
I think the misunderstanding here is that the 2820 chip is speced at 2.13Ghz with a 2.4 "turbo" mode. I think you only get the 2.4 speed when a single core is running.
I think BIOS and Windows are just reporting the base dual core speed.
LessMoss, Intel® has a tool that will test every single component inside the processor and then will generate a report. I recommend you running the tool named Intel® Processor Diagnostics Tool. It can be downloaded at the following link: https://downloadcenter.intel.com/Detail_Desc.aspx?agr=Y&DwnldID=19792&lang=eng&OSVersion=Windows%207%20%2864-bit%29*&DownloadType=Utilities%2C%20Tools%20and%20Examples
Just in case, the processor included on your NUC is the
Intel® Celeron® Processor N2820. This chip does not have Intel® Turbo Boost Technology http://ark.intel.com/products/79052/Intel-Celeron-Processor-N2820-1M-Cache-up-to-2_39-GHz?q=N2820