i updated to 603 bios and follow this guide. now on xtu i can undervolt cpu. for now i undervolt to -115 and take turbo boost to 30.00w . the problem is that xtu doesn’t maintaining the setting after a reboot.
Your voltage is too aggressive you can only hope for -100 max usually. try -60mV first and if the system is stable it will keep voltage after reboot. Then try even lower etc…..