PC crashes only when stresstesting

I built my first pc a month ago and everything works completely fine but after stresstesting with occt i have multiple errors on multiple components.

I played games like warzone and cyberpunk on ultra settings and everything went completely fine. (I only had one crash while playing warzone one time and i think the fans are too loud even on low load). Temps of Gpu while gaming on high load is always around 60-65 celsius and the cpu is around 65-78 celsius.

Specs: 4080 super oc Ryzen 7 7800x3d G.skill trident neon z5 32gb 6400mhz Nzxt c1000 80+ Deepcool Assasin IV

The first time i stresstested the vram my pc crashed and rebooted but the second time everything was alright. I have multiple errors on the cpu and the ram. PSU looks fine.

Can someone maybe help?