http://images.akamai.steamusercontent.com/ugc/396676045188283554/3E8EED1F77DCC34E7D1A7C257804A28536743FF3/

I get something similar to this in other games with skyboxes, most notable in WoW. I'm using an r9 290, patched to the latest driver. Any ideas what could be causing this; or what this might be called so I can google it and find some solutions?