Will a games RAM requirement take up all the RAM? I have 16gb and the game in question takes 12gb The game in question is Godfall. I have a decent gaming laptop but its relatively old but it meets the minimum requirements. I have 16gb of RAM and after looking at it recently I still have 15.9 free space of RAM. Godfall at minimum requires 12gb but recommends 16gb. 
So I know I meet the requirements but I've always wondered. When a game takes up RAM, does it use up that space the same as regular memory storage or does it work differently.