Undervolting SoC for higher Frequency?

[Klemen]

I have XMP enabled, also I have PBO on as well and I hit a barrier with 3200MHz on 1.15V SoC when i undervolt it to 1.1V (default) i can get to 3533MHz, but it gets unstable and past that point i can not go further, unless i now for real undervolt it a bit lower so i can get to 3733MHz. 1.05V on SoC seems to be too low -it gets me in but crashes real fast but it also worked on 1.075V but again unstable. 

 

What would be the sweet spot with something as Patriot Steel Viper 3733MHz RAM to work stable on at least 3400-3600MHz? They are Hynix C-die rams 2 moduls 

 

VDDG was set between 950mV and 1050mV 

cLDO VDDP was set to around 1050mV 

and DRAM Voltage to 1.35V to ensure stability. 

 

But with that said, SoC Voltage was the crucial thing i was playing around with, with PBO enabled (i think) doesnt like higher voltage or it wont even post with freq beyond 3200MHz with 1.15V 

Basically i could increase higher SoC voltage and as long as it doesnt go past 3200MHz it will be alright, but beyond that i'll have to lower it.