Computer randomly turning off...

[Scribble Nerd]

When I'm playing a game, my computer just randomly turns off... no BSOD, just turns off as if I we're holding the power button... I am thinking this is my PSU but I am not sure... I bought the computer from IBuyPower at BestBuy... The specs for it are:
i7-8700(non-k)

PowerColor AMD Radeon RX 590 (Used to be a GTX 1060 3gb but I upgraded it)

16GB DDR4 2400MHz

120GB WD Blue SSD

1TB WD HDD 7200RPM

1TB Seagate HDD 7200RPM

512 Seagate HDD (laptop drive) 5400RPM

 

The link for the computer is here

 

I did some tests and it seems that there is no voltage change and when running a OCCT Test it shows 8 errors in about 20 minutes (20 minutes is about where my games crash), while running the test the computer doesn't seem to shut down... I have not overclocked anything in my system...

 

This doesn't happen when not running a game

 

Thermals only go up to 80C max

[Sauron]

It could be your power supply as you suspect, an rx 590 draws more power than a 1060 if I'm not mistaken so it's possible your PSU simply can't handle it. The easiest way to diagnose this would be to try with another power supply. You can also try removing the graphics card and using the integrated gpu, see if that's stable - if it is that would isolate the problem to the graphics card or the power supply and since you didn't get a BSOD it's probably the latter.

[berberries]

I would say try by removing the psu or placing your 1060 back in the system to test if it s stable. it is likely a power supply issue as that is usually the cause of straight up power offs of a pc