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"RAM Boost" or "Virtual RAM/Memory", is when the system uses part of your storage to cache infrequently accessed information so that more RAM is available for frequently accessed data (the stuff actively being used by apps)." :/
Depending on the brand of laptop you have, you might be able to find compatible RAM sticks of higher sizes, like 8 or 16GB. Emphasis on compatible! RAM sticks for laptops can be different from the ones for PC.
Then you'll have to take your laptop apart to install it.