Starting point: "Oldschool game World of Warcraft".
The manufacturer should provide some listing of hardware and OS specs for the game.
Usually hardware specs are in the form of "minimal", "recommended", and "best".
You do not want minimal and your do want as much best as you can afford.
As for gameplay some difference in fps may not even be noticeable.
Your question is a bit broader than just "Displays" so I am moving the post to PC Gaming.
Very likely that some Forum members therein can provide further thoughts and suggestions.