that looks almost like the bad nVidia 20-series GPU failures of late (but it's different). See this video:
I get some kind of texture overlay only in very specific areas and very specific pieces of geometry (like a flat ceiling, but none of the details that protrude off of it) in Borderlands 2. It reminds me of that, but mine is much more subtle - it's a straight array of horizontal lines, not a dot pattern like that. That specific issue had me thinking my GPU was dying, but it only ever appears in that game and in specific places so I wrote it off as bad programming.
Is this overlay persistent for you?
