Hi guys, I've recently found out and experienced better stability on my OC settings. I just wanted to share my experiences on my OC 4.5Ghz on 3570K @ 1.288V - 1.296V max stable both manual and offset voltage and my goal was under 1.3V only and it was successful!
But surprisingly not so so stable in DOTA2 (sometime crashing and returning to desktop) and checked WHEA errors in windows and found out some instability issues while gaming even though I'm super stable in other games and Prime.
So in order to get fully stable in my DOTA2 and WHEA i need to increase the voltage one step a time while gaming until I've reached 1.336V to be fully stable and out of errors and it's already over my target.
The end result was lowering down my OC to 4.4Ghz to meet my target of under 1.3V and there is no significant performance difference between 4.4Ghz and 4.5Ghz other than increased my temps and keeping my room warm. lol
My final OC settings is 4.4Ghz @1.280V High-Offset and been stable and happy since.
Hope this helps others and check their WHEA errors in event viewer from time to time to find out. Peace!