It holds all the data you need for the game while it’s running: the game’s code, textures, sounds, 3D geometry, maps, as well as the state of the game itself: where you are, how much ammo you have, etc. If you don’t have enough things are going to run really, really badly.
Today I’d say 16GB is a minimum for good performance, 32GB is desirable, and 64GB is probably overkill for most, unless you’re doing other things than gaming.
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