hello , try to disable hardware acceleration in internet browser to see if it helps .... but green artefact is never a good sign for vram if the card is not overclocked .. try to raise fan curve maybe if you see this artefacts and see if it helps
That VRAM temp is a bit high, 90c is peak, 80c is marginal. The closer you get to max the more likely it will do that. I would do what @xlox said and turn off any zero RPM fan options for starters and raise the curve some. Check your case airflow, etc.