Question My PC suddenly turns off, when gaming on ultra settings usally

[ski4l09]

running vega 64 with 2700x and a aio cooler, using a 850w thermaltake 80 plus gold, i dont know if its the mobo, cos everything eles seems okay when i benchmark the computer it can get really hot no issues but when i play a game the computer really cool to touch but cuts off , just confused now, any advice would really help, thanks in advance

 

[rgd1101]

what game?
where did you get it from?

 

[ski4l09]

what game?
where did you get it from?

divison 2 and DMC are two i can confirm cuts me off , i got them when i got my GPU as a bundle digtal download, but there is other games like MetroExodus that give on a few mins befor that cuts off