Hey there, this has been something I've wondered about for a while now.
Think of when you're playing a game, and you can see stuff "Pop In" like grass or anything else that loads as you get closer to it. It's sort of obvious why games do this, it would use a lot of ram to load in all the textures, grass, etc... It usually loads once you're a certain distance from it. Some games aren't as bad as others.
But I was thinking... I have 24GB of RAM, why not have it load everything? I use around 3-4GB of RAM while playing a game. I'd love to have my games use more of the ram.
But, maybe its loading all that onto VRAM? Maybe it's the 2GB on my card that is storing all that information? I'm not sure how this works, is it the VRAM or the RAM that is storing all the textures in game as you run by?