Will upgrading to 32GB of RAM fix 4K stuttering in games?

Probably not. 4K stuttering is almost always a GPU or VRAM problem, not a system RAM problem. Most AAA games still use 12-16GB of RAM, so 32GB only helps if you’re actually hitting the wall at 16GB—check your usage while gaming. If it’s below 14GB, more RAM won’t change a thing; look at GPU utilization and VRAM usage first instead.