I play E-Guitar for Years, listen to Death Metal and play Games on PC since 1996.
I work as CAD Engineer and construct Robotic Laser Arms/Welder for the Automobil Industry.
My Favorite Gernes are RPG´s and FPS.
Sounds like your CPU cant handle the Speed for some Reason. Although 3600 the optimal speed is.
If you just bought it, RMA it and tést a new one. I doubt its the Mainboard.
They are basicly the same. Asus uses LG Displays, its just an overclocked Version from 144Hz.
You can safe Money if you choose the LG one. 144Hz is more than enough.