Ehy, thanks for your quick reply.
I don't know if I have understtod correctly, now I have a question.
I need to keep the CPU as fresh as I can. That's the reason why we use coolers.
When OC I look at the CPU temp not to coolant temp. I kave in mind to not to go over 80°C at CPU cores.
If I have a difference of 30°C between CPU cores and coolant, does it mean that heat is not trasferred to the coolant in an efficient way?
(Anyway you are correct. to reach 4.2 GhZ (base clock is 3.5, boost is 3.9) I doesn't had the need to increasse voltage, so I'm using the stock voltage at 1.168 V and I'm stable. To reach 3.3 I need to bump up vcore.)