[SOLVED] Cant change CPU clock ratio past 39

Nov 12, 2018
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I recently tried manually overclocking (first time) my CPU through BIOS and did it .1 at a time. But when I was going to go to 4.0 GHz I went to change the value from 39 to 40 but when I pressed enter it just went to Auto (this made it return to 3.5 GHz) Does anyone know how to go past 3.9 GHz, I have an i5-6600k and a Gigabyte H170 Gaming 3 motherboard. If anyone has any help let me know.