need help undervolting my cpu

[dreamcast4599]

currently have a 3900X alongside an asus CH7 hero non wifi. i want to set a -offset to undervolt my cpu but idk what settings to use a friend of mine said to use an offset of -.0125 volts for the vcore but idk

[TheBean]

each cpu is different (even if it is the same model). some cpu can undervolt a lot if you get lucky, while some may not undervolt at all. 

what you can do is decrease it a little and test if it still works, then decrease it more and test again. keep going until it stops working. once it doesnt work anymore, increase it more than the lowest you could go (to make sure it is still stable) .