Here's the million dollar question though. Why in the hell would you even care as if you bought this TV, why on earth would you want to display unconverted 1080P content? I mean, yeah, you tube videos will look fine at 1080p, but for Windows desktop environment, to gaming, just leave it at native 4k, and to hell with 1080p. Looking at your sig, you have a 980 Ti, so more to the point of keep it at 4k, and move along....
Believe it or not, I chose the Samsung TV over a bunch of 4K monitors due to its great 1080P. Most older games don't scale well past 1080P. I hook up my PS4 to it. Most monitors look awful at non-native resolution which was why I returned them all. Also, sometimes I need 1080P/60FPS for competitive gaming. 1080P, 4K, 21:9 1440P, it does it all. Everything except Gsync,