Just to add to the folklore on this, I was getting this issue sporadically (and only one black poly at a time) on my 1660S. Incidentally I was using an AMD 280X on this system previously. I haven't noticed these for the last week or so after I: Updated the drivers, cleared NVidia shader cache, cleared the DCS shader caches, repaired DCS, and cleared the DirectX shader cache. Fingers crossed they're gone. I underline the last step because I don't see it mentioned here yet, and maybe there was something lurking there from my old card.