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Memory (RAM) comes in five tiers, with increasing sizes (each tier's size is configurable). They fall into the three item tiers like so: {1, 1.5}, {2, 2.5}, {3, 3.5}. Memory isn't really a component, since it does not provide any Lua callbacks, but it can be installed into computer cases to increase the available RAM of the computer, which allows running more complex programs.