Think of your hard drive as a series of bookshelves. You can’t read a book on the shelf. Instead you take it to a reading table (RAM) and lay it open to read it.
The more RAM you have the bigger the table and the more books you can have open at once. If the table fills up, you have to return a book to the bookshelf before you can get to another.
Some games might need you to read 4 books at a time, others might need 8 to get the information fast enough.
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