Computer restarts every time i play video games. Please help

So i finally upgrade my computer after 8 years and after finished building it, everything works fine but everytime i play any sort of games on it, my computer would restart itself. My setup is

Ryzen 3900X
Geforce GTX 680
MAG X570 Tomahawk Wifi
Gskill DDR4 3600
Corsair HX850 watts

My GPU and power supply is the only thing i havent upgraded yet. And it seems like everytime i play my games on a very low setting, it would take a while to reboot itself. 


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