This question is very important. Unless you mega lost the silicon lottery and you have to go to 1.3 V to get Ivy stable at 4.3 GHz (this is like the bottom 5% of chips in overclock limit), you don't need to delid. The chances of getting such a chip are so low that it's more likely:
1. Your cooler is bad.
2. Your cooler is not seated properly.
3. Your motherboard's voltage regulator sucks.
4. Your BIOS settings are bad.
5. You have a motherboard that shipped with pre-release BIOS and you need to update for stability.
6. You have a cheap motherboard that requires tweaking C States, load line calibration, RAM voltage, and other settings to workaround it's flaws. Google OC guides for your motherboard.
I won the silicon lottery at home with my 3770K @ 4.6 GHz with 1.22V VCore, but I have overclocked many chips at work and the worst I have seen in 4.3 GHz, but it's stable at 1.24V VCore at 65C.
Okay, I was running 4.0ghz at 1.1VCore. Max Temps were about 60C with the H80i.
Im just bumped it up at 4.4ghz at 1.20 Vcore, and my temps are hitting 77-81C with intel burn test. Something wrong with my heatsink install?