im just starting to get jelly of 4K now, im running a GTX970 in 6 year-old rig. my auto-adjust settings set D2 at it's LOWEST, and i still think the game looks fine. framerate is stable and 60, and doesnt make my PC sweat very hard, either.
but all that untapped potential...and crypto ruined the GPU market bad (for now), so 4K is still years away for my BROKE AS FUCK ass.