Does CPU speed matter for gaming on a Mac Laptop? The difference between, for example, 2.4 Ghz and 2.6 Ghz will be negligible when running the games. What will contribute to the smoothness and quality of the games the Graphics Processing Unit (GPU) and to an extent bus speed, CPU cache and RAM. When it comes to RAM, the more the merrier – to avoid the Hard Drive being used to swap applications when your memory is full.