Overclock not working

May 17, 2018
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Hello everyone, I am currently trying to overclock my i5 7600K with a corsair hydro h100i v2. I am using a gigabyte z270 gaming k3 motherboard. I overclocked my processor (i tried to) to 4.8 ghz. I used a voltage of 1.280 . When i start my computer my processor runs at 4.8 ghz for about 3 seconds and then it goes down again to 4.2 ghz (turbo clock). when i restart my pc and go into my bios again it still shows its running at 4.8ghz. I disabled all c states en eist. i also updated my bios and cleared the cmos. does anyone know how to fix this?