To make sure I understand, are you able to play the game when you have the settings reduced to meet your system performance limits? As in, when you set up a game that says it meets your system requirements of 2 cores and a maximum of 16GB of RAM at most, are you able to play without issues?
If no, please provide additional explanation about the issue you're experiencing so that I can better understand.
If yes, then the bottleneck here is that you are limited to games that are small enough for your system to handle.