PC black screens and restarts 20-30 minutes playing a game

[davidmac2]

Hi so I just completed my first build https://pcpartpicker.com/list/HMpbzY a few days ago but when I try to play any games more demanding than games like CK2 or HOI4 maps type games I get a black screen and the PC restarts 20-30 minutes into playing frames are solid while playing high or very high graphics temps at idle reach from 25-35 under load 43 using Prime 95 GPU goes to around or just below 70 from what I've heard these are fine temperatures so that shouldn't be the problem so I'm wondering if it is being caused by the PSU or that it is indeed overheating I've two outtake fans and one rad with two 120m fans as intake with a cpu liquid cooler any help would be appreciated. Any more information needed just let me know.

 

[richpixel]

Any over clocks?

 

[davidmac2]

Nope haven't changed anything with any part tried the memory diagnostic test with both ram sticks came back no errors, when the PC crashes the fans in the GPU get very loud then it tries to restart takes a bit so I end up just resetting it