You don't need to waste your money over GTX 1080, there's no "future proof" such thing, you going to be forced lowering down to low-med graphics setting in 2 years overtime, so don't do it, a lot of GTX 780/980 owners found it wasted, and upgraded to GTX 1060/1070 least and then lowered few graphics setting a bit.
Also, your RX 480 should be fine at 1080p, you need to tweak/optimize in-game graphics setting and always update driver to get the games run smoothly & stable(or sometime could be gets worse xD), that is why Nvidia decided to make their own optimization guide in site and Geforce experience app for Nvidia owners.







