I'm not an expert on these things but i read somewhere that to run 4K properly you need GTX1070,GTX1080 otherwise you'll have stuttering.
I'm still playing on my old Sony Bravia with 1360x768 resolution and i also have GTX1060 lol.
But it still looks good enough.
I wish i could play in perfect smooth 4K but you need a shitload of money for all these TV's,graphic cards etc.
But if you can afford it i guess it's worth it.
Just make sure to search this thing well otherwise you'll end up paying so much money and still won't have the result you expected.