[SOLVED] Newly built pc freezes on some games(GTA 5 3Dmark) and restarts on csgo sometimes

[xyz0717]

My pc was built Dec 2019 and I keep having problems. First is that it could not run 3dmark or freezes while benchmarking or error reports poped. I sort of fixed that by updating the bios. It would still restart automatically sometime when gaming for a while with no bluescreen or anything at all. Around two weeks ago when I was playing GTA 5, the system froze and the sound was looping, I had to turn off the computer by pressing down the power button. Since then my computer refuses to run GTA 5 at all(freezes after the game is loaded) and 3d mark still gives error report or froze while benchmarking. I have tried reinstalling windows and no luck there. I have also stress tested the GPU and CPU with msi kombustor and there has been no crash while stress testing. Two days ago I used memtest86 to test my mem and no errors either. There is no crash during normal use except one time while I was watching a movie. So I am guessing it is either the MB or the PSU's problem. All components of my pc were new. Please help, thanks in advance.

My build
CPU: i7-9700k
GPU: EVGA 2070s xc ultra
RAM: Corsair vengeance rgb pro 3200mhz 2*8g
Cooling: Corsair h100i
MB: MSI z390 gaming edge ac
PSU: Corsair CX 750M
Storage:
1. SAMSUNG 970 EVO Plus 500GB
2.WD - Desktop Everyday 4TB Internal SATA Hard Drive

 

[rgd1101]

could be the psu if it stress test both gpu and cpu separately and only fail when using both at the same time(games)

 

[xyz0717]

could be the psu if it stress test both gpu and cpu separately and only fail when using both at the same time(games)

Thanks for replying. Yea that is what I am doing today. My friend is coming to my house with his PSU ( still a Corsair CX 750m) today and we gonna swap out mine and run with his. Will update the result