Does the computer shut off completely while playing a DX11 or 3d heavy game (i.e. FFXV, Tomb Raider, etc.)? Meaning, all the fans on the chassis turn off as if it lost power and in order to turn back on the computer after the blackscreen you have to flip the switch on the power supply to be able to restart the computer? If so this means the PSU is not able to handle the Vega 64's transient load spikes which can exceed the total amperage rating allowed for that specific PSU on its 12v rail. I cannot speak for many other power supplies but I know that the one that I fixed the issue with was a Corsair HX1200. I had this same problem I described above while using a Seasonic PRIME Titanium 1000w so I do not recommend Seasonic PSUs be paired with Vega 64, instead get a Super Flower (EVGA rebrand) or CWT (Corsair rebrand). These brands are more tolerate of those extreme load spikes compared to Seasonic.
Thanks for the reply.
On the contrary, the PC stays on while it loses video signal, the GPU fans seem to start spinning at 100% but the temps for both CPU and video card are just fine.
Is this still consistent with the problem you said (and that I knew about already)?
You got the game right btw, I was testing with FFXV and 4k textures pack, the very first scene of the game is stable even tho it gets to 100% usage but it crashes during the first ''open world cutscene''.
Also, thanks for the PSU suggestions.
I will consider those for sure, but I first want to make sure that is the problem.
I also just tried raising the power limit just to see what would happen and it crashed before I could even get to the menu.
I use a Corsair TX850V2 and so far no video card is such a power pig I cannot run it, Corsair has been my choice but I get their higher performance models.