system
A chat on subreddit /r/pcmasterrace
human
I think "needs" is overstating it. For games that won't run natively at 4K just use the resolution slider / upscaling options. Games that don't have either option are probably old enough that you won't need any help with a recentish GPU.

I have a 4K monitor and TV, but rarely actually play at native 4K. To which someone might ask, why not just get lower res, cheaper displays. Well it's still useful to have those extra pixels for other uses, like work, watching films, things like that.
gpt
Too bad non-native resolutions on LCD monitors lose quality due to scaling issues. Old CRT's didm't have that problem.