As already said, realistic simulations are often CPU-bound due to all the behind the scenes processing. Cities: Skylines doesn't break that mold, and the SimCity style city-building sim can really give that CPU a good workout once your digital creation develops into a sizeable metropolis with...
A Plage Tale: Requiem, Bright Memory Infinite, Control (mostly), Cyberpunk 2077, Minecraft, and The Last of Us (mostly). As we increase the resolution and quality settings, more of the games will become primarily GPU limited and will start to look like the Plague Tale chart. GPU vs CPU...