Aurora R12, i5-11400F, enable turbo boost

You could try using Intel Extreme Tuning Utility . . . be very careful!

Do you mean it is not possible to enable it in the bios?

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@MichaelTeoh wrote:

I would like to know if there is a way to set my CPU speed to Max Turbo Frequency which is at 4.40GHz.

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Sorta.

Queue-up enough actual work for it and it will Turbo-Boost to get it done.

Remember, it's just an i5 and not K-class or equivalent.

That means your processor will spike to 4.40 GHz briefly to complete a task as quickly as possible, probably single core, not run at a constant 4.40 GHz. The previous XTU program I mentioned has a 5 minute CPU stress test and a lot of metric readouts so your can see what your processor is doing during the test, including Turbo Frequency.

That's the maximum turbo frequency. Hoover over the question mark to get more information on it.

I am referring to this datasheet. I am not sure if Dell locked this option for performance stability purposes.  

I just realized that the CPU speed able to raise up to 4.4GHz only if I enable the Intel SpeedStep® Technology. But the speed will have fluctuated from 1.4GHz - 4.4GHz. That is no way to enable Turbo speed in intel i5 processor with Dell motherboard like Branded motherboards (Asus, MSI, Gigabyte) 

It will boost up and down pending the load, that is by design. You have an F version CPU. You would need a K version to be able to lock the frequency at a higher state aka overclocking.