A ram disk will only speed up your load times, not boost gaming performance.
Gaming performance is related to what cpu or Gpu you have as said.
It would only improve the amount of time to load the game, and when loading new levels of the game in question.
A ram disk would only ever be effective if the system was left powered up, or for example if you used sleep mode of the pc.
If you were cold booting most of the time then an Sdd drive would be of better use as an example.