cpu i5 8600k

i can run 1.3 v and 4.5GHz but can I possibly go to 1.2v and do the same thing is that safe or will I be taking some kind of loss 2.5v maybe? while at 4.5GHz 100% stress test temps were 60-75 usually that's not that hot but like I don't like it so that's why im asking if I could tone down the...