https://en.wikipedia.org/wiki/AAA_(video_game_industry)
An AAA game (usually pronounced "triple A game") is an informal classification used for video games with the highest development budgets and levels of promotion. AAA game development is associated with high economic risk, with high levels of sales required to obtain profitability.
E-sport: Dota 2, CSGO, LOL, BF1, etc
these kind of games don't need high spec to be played smoothly
AAA: GTAV, Titanfall, Prey, Mordor, Tomb Raider, etc
these kind of games had a variety of requirement, some need high specs, some supports even the low specs
Prey for example, despite depicted as an AAA title, doesn't really demand as much as the other AAA games (with 1050ti, i can play max settings with fps staying above 70-80 all the time)
while GTA V demands u to have a pretty capable CPU in order to play it smoothly (CPU intensive games, the more threads u have the better)
depending on how old is the game, requirement might vary
with the R7 260X i mentioned earlier, playing on med-high should be possible (it performs on par with 750ti if i'm right, which is still pretty capable for playing today's games)