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questionfor VDDCR undervolting and performance enhancement setting

Level 7
Hi, everyone, I am new to overclocking
my cpu is 3900x, and motherboard is rog b550-f
I see that if I do negative 0.05V offset on the VDDCR voltage, and leave everything else untouched, CPU can run fine, no performance drops but the temperature drops 5 degree from 85 during stress test!!

Question: will this hurt CPU in the long run? if you have similar experience, what's your maximum negative offset to make everything safe?

2nd question:
I saw Asus performance enhancement in BIOS, should I turn this on? what's the mechanism behind this? can this combine with CDDCR negative offset and still achieve stable system?

thank you