Question CPU Turbo Boost problem

Oct 1, 2019
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CPU: I3-9100F 3.6
GPU: RX 460
MotherBoard: MSI H310M pro VDH plus
PSU: Deepcool de600 v2
RAM: 1x8GB 2666mhz

Guys, the problem is that my CPU boosts itself to 4.0ghz only, but its maximum is 4.2. I dunno what the problem could be, so please help me d;