Most all game vendors publish minimum and optimal system requirements. Check those, and also search the forums for the games you are interested in for relevant user comments. Games can be CPU-intensive, GPU-intensive, or both, and that has to be taken into account when evaluating manufacturer published h/w requirements. You'll get additional input from the comments made by users in the forums. You should take manufacturer published specs in conjunction with user comments. Another issue can be as subtle as the impact of the number of players in a given map, and how that and particle effects affect FPS. I play one game in particular where boss battles can have as many as fifty players involved...more in open-world boss fights. With graphics settings at maximum, including particle effects and post-processing settings, this CPU intensive game can have frame rates that drop dramatically in those settings. Even with the latest Alder Lake processor and an nvidia GTX3090, I've had frame rates drop as low as the teens in intense boss fights. That same game in casual uncrowded play will give me frame rates north of 120. So sometimes, knowing this, I'll turn down the graphics settings to keep frame rates above 60fps. Bottom line...it's not a simple topic to consider.
How do I check to see if my system will run a specific game?
"DS: How do I check to see if my system will run a specific game?"