Get Malwarebytes for free and do a full scan. Did you change any settings like in your bios? I overclocked my CPU once and it manually set my industrial Noctua fan to 3000 rpm and it sounded like a jet plane. If you set something to like "always use best performance" it might be that. Otherwise if your GPU isn't used at all and it's just the fan it might be some manufacturing issue and the card just broke.
Try EVGA precision also. If you're clean and it still happens, the logical thing would be to contact your manufacturer, like Asus or Gigabyte, about the issue and they will give you more details.
So check your GPU usage also, not just the temps.