If nothing is broken and the driver doesn't intro anything new I would just stay put.
But it should probably be swapped out now. Where to go is dependant on your budget. 4k requires allot of power, I would just aim for whatever resolution you game at.
not speaking for all and if I am wrong I never said it.
(plz note that is meant as a joke)
Gigabyte Z87X D3H - Intel i7 4770k @ 4.5Ghz - CoolerMaster Hyper 212 Black RGB - 16Gb Kingston HyperX Black DDR3-1600 - Asus DRW-24F1ST DVD±RW - Samsung 850 Evo 250Gib - 4TiB Seagate - Asus Radeon R9 Fury STRIX - Creative AE-5 Plus - Windows 10 64-bit