Graphics card performance 1440p & 2160p
Graphics card performance 1440p and 4K UHD
Wide Quad HD then ...
Starting at 2560x1440 the results get shaken up, Nvidia is advancing here. However look at that RX 480 and 390X go, compared to the the Fury series that is. Crazy to see and it does not make much sense either. Realistically though anything above a GTX 1060 or R9 390 (Hawaii) still managed 50+ FPSes.
For the more hardcore PC gamers a preferred resolution is WQHD which is short for Wide Quad HD, a resolution of 2560 x 1440 pixels. Let's just call this the more more sexy resolution opposed to the ever so popular Full HD.
The big mac of screen resolution then. Commonly addressed as Ultra HD, UHD or 4K, this resolution refers to approximately 4000 horizontal pixels. Ultra HD resolution has four times the number of pixels of a typical 1920x1080 resolution. This resolution and Ultra quality settings require lots of memory, hence the cards with more then 4 GB jump ahead. You'll need a bit more 'beef' inside that PC of yours.