I use a Samsung 4k 60hz monitor , U28 E590.
No a 'super gaming monitor' by any means , but it can do 60Hz at 4k over one Display cable.

I drive it with 2x GTX 1080 TI in SLI mode . And yes , FF XIV scales pretty good with almost double the frame rate in SLI over a single card.
UI and text scaling is no problem . Pixels almost unnoticeable at viewing distance , so anti aliasing is not necessary , not that it really impacts frame rate.