I am new to pc building and built my pc not too long ago. I noticed that the i7-9700k is able to turbo boost up to 4.9 ghz but I noticed that my speeds stay at 3.8 ghz in task manager as well as hwmonitor. However, when I restart my pc or boot it up, it seems to be able to reach speeds around 4.1 ghz before going back down to 3.8 ghz again. Turbo boost is enabled in my BIOS as I checked. I am using the ASUS Prime z-390 motherboard. My temperatures for my cpu also do not seem that bad at 35c idle and usually around 50c when i'm in a game.