What is lowest CPU voltage for i7 7700k i can do?

See if you can, it will likely work fine at that voltage as well, but see if it can still handle something like a Stress test. I would say going below 1V is likely not at all worth it (you will probably have to under clock just to get there) but experimenting is the only real way to know, each processor likes different voltages.
 

Esaelias187

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ive actually overclocked mine to 4500 mhz and it is on 1.176 volts and working fine

i stress tested for about 30 mins and no problems

i did it throug bios
 

VxDxEEE

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Can You send a picture of Your settings?
 

Esaelias187

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like how?

how can i do that?