Any good video card can support 144Hz, personally I have a 1060 6GB, but the problem with buying video cards is due to the COIN Mining bought them / buying them all up and driving the prices 2-3x higher than they should be. But yes 144Hz is showing 144 frames of information rather than 60HZ (60 frames) which is all you normally get on 4K . 144 frames of information lets your mind see the more 'motions' in a action and let you react better in gaming than just '60' frames of information which you 'guesstimate' your reaction. Linus did some videos to demonstrate the differences, but like I said, you can HAVE a 4K display, but it doesn't MAKE the games 4K graphically detailed, it just makes them 4K SIZE, unless they have native high end modelling and textures INCLUDED with the game. Even with a i7 current Gen a 1080 trying to show Andromeda at 4K natively crawled to 30 FPS (check the numerous articles on this).
Here is a previous post I did which has the links in it I speak of and the break down of the tech.
http://www.tomshardware.com/forum/id-3471795/gaming-monitors-scam.html#xtor=EPR-8807