Overclocking questions help

ztdz800

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Jul 5, 2016
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Hi just got a i5 6600k whit an asrock z170 pro 4s my problem is whit the voltages if i let it auto it goes up to 1.4v and thats bad so i wanted to use offset mode but i didnt know how it works it said -100 so i thought +5 will do well it didnt even started windows how do this mode works?

By the way is a light overclock just 4.2
 
Cpu i5 6600k voltage i get stable 4.2 at 1.235 but it stays like that because its fixed i want the voltage to go down when it isnt needed but i dont know how offset works