You may be able to fix the problem by adjusting or removing something in your load-order. It might just be a settings problem with shadows or the your game has messed up pre-combined meshes.
It really could be anything; I've been trying to find the right combo myself.
I too, am running the game with a 1070 and getting frequent crashes, so I understand the feeling for just wanting a brand new shiny RTX 2080 super.