Thank you for posting in the Intel Community.
The Intel® turbo boost technology is included on the Intel® Core™ i5-9600K Processor (https://ark.intel.com/products/134896/Intel-Core-i5-9600K-Processor-9M-Cache-up-to-4-60-GHz-) to be enable on the system this has to be done on the Motherboard BOIS in order to confirm if this feature has to be manually enable or if it is automatically enable you need to confirm it with the motherboard Original Equipment Manufacturer (OEM).
Hope this helps.
Intel Customer Support Technician
Under Contract to Intel Corporation