CPU "sweet spot" when overclocking?

Stillings

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Apr 1, 2017
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This question is for the veteran overclockers out there. I searched around online a bit and couldn't find the exact answer I was looking for. Basically, I just completed my first ever PC build a couple of weeks ago. I'll post the essential specs below. When overclocking my 7600k, I managed to get 4.6GHz stable at 1.22V. However, anything above 4.6GHz requires significant voltage boosts. For example, I was not able to get 4.7GHz stable until I raised the voltage to 1.29, 4.8GHz at 1.35, and 4.9GHz at 1.4. So it seems that having my CPU at 4.6GHz at 1.22V is a sort of "sweet spot" for lack of a better term. My question is simple: is this normal? I'm concerned because I find it slightly strange that just a 100MHz increase in frequency requires a large boost in voltage to remain stable. Any insight on this would be appreciated!

CPU - Intel Core i5-7600k
Motherboard - MSI Z270-A Pro
Cooler - Corsair H100i v2
PSU - Corsair RM-650x
GPU - EVGA GeForce GTX 1060 6GB
 
Solution
It is normal. If you google for graphs of overclock vs voltage you'll see lots of graphs that bend - requiring bigger and bigger voltage increases for each step up in clock frequency.