I just did fresh install of windows 10, almost only blender installed on the pc and essential drivers, the problem is still occuring.

I also noticed today, that my CPU is heating way more when in the rendered viewport than in any stress tests (tested Aida64, Prime95 and OCCT)
Stress tests don't trigger any error and CPU is slowly ramping up to 80°c.
On blender in the rendered viewport, the CPU ramp up almost immediately to 80°c then up to 85°c.
If that can help to find what's going on.

Thanks for the help Alaska 👍

Yeah, i also thought it wasn't gpu involved since i changed it.
i'm not familliar with the way a CPU works, does this type of error is induced by a faulty CPU or it is only a software problem ?
I haven't seen many reports on people having troubles using blender on a Ryzen 9 3900x

A friend just gave me his GTX 1070 to test if the problem was still here, i installed it, with a fresh install of the latest drivers, and still, it crashes within 5min of fairly simple work on blender.
Here's again the crash logs with the new graphics card :

Here's the files you requested from portable blender, there's 2 debug output from 2 .blend but same error. and the file from the tmp folder

Thank you a lot, I'll try that and keep you informed within 3 hours.

The crash log i provided isn't complete?

I'm using the lastest blender version found on Steam, I'll try to get it from blender.org if that can cause an issue

Yeah I thought that would be looking weird on the screenshots, but I have completely uninstalled the megascans plugin and the problem is still here...
I can provide a screenshot too, it's the same error without the "megascans" lines in the cmd.

It was because of an hardware failure.

Crash is happening when looking around in the rendered viewport on cycles (CPU mode)

Here's the crash log