New Aurora R7 OC grayed out

As far as I know  the k suffix intel processors are unlocked for overclocking.

Having said that, I had the same processor as you but don't recall if I tried the bios fto overclock it. 

I run intel cpu monitoring program that displays cpu frequency and it did go above the rated GHz. 

I upgraded to intel i5 8600k and the options in Bios for clock rate and voltage are enabled except xmp. 

Has to be the series ending with "k".

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@Arkini wrote:

I just bought an Aurora R7.  The spec for the CPU as below.  Original is 2.8 GHz but on Dell's website stated that I can boosted to 4GHz.  I went to the bios and the OC and XMP memory were grayed out.  

8th Gen Intel® Core™ i5 8400 (6-Core, 9MB Cache, up to 4GHz with Intel® Turbo Boost Technology) 

 

 

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An i5-8400 will Turbo-Boost itself to 4.0ghz if you give it enough work to do (like with Prime95, OCCT, or encoding a video).

Over-Clocking is a different thing, and only an Intel K-class processor can do that.