PC freezes when overclocking
Hello everyone. I have one problem with my new pc for about 3 months. Every time when I try to overclock system my PC randomly freezes.. while gaming or during desktop. It's can happen after 2 or 6 hours randomly. I tried to overclock my PC with EZ Mode (asus utility on bios). I also tried to overclock manually. I already did stress test and my pc doesn't fail. Temperature while gaming never goes above 70. PC specs:
i7 7820x, Rampage VI Extreme, 16gb Hyperx Predator 4000mhz (2x8), 1080 Ti EVGA FTW3, EVGA 1000W G3, Corsair H115i PRO RGB 280mm, 250gb 970 EVO m.2 ssd, 2TB WD Gold hdd.
I increased voltage everytime. I tried 4.4ghz vs 1.270 voltage.. it still freezes after 2-6 hours randomly. People with the same cpu puts 4.7ghz 1.260 voltage.. so it's more than enough 1.270 for 4.4.
I don't know what to do.. so I need help.