My 1440p monitor died on me so I'm looking to upgrade to a 4K monitor, to be used with my home+work laptops, some older game consoles and an aging Linux PC.

The aging PC is the problem: it's an i5-6600 on an Asus B150M-A. It lacks DP and its HDMI port can't do 4k60.

I vaguely recall there being super cheap graphics cards meant for exactly this sort of thing, just a low end GPU with a bunch of ports, but I can't seem to find much, especially not AMD (Linux + Nvidia remains meh)

Suggestions? Perhaps a minimally invasive upgrade to the PC? Or just stick it out at 1440p (non-integer scaling, ugh) until I can upgrade properly?