What would you do with a computer that can run 10,000 programs at the same time without any sign of lag? What would you put onto a harddrive that can hold the entire Library of Congress, US Patent Office, and all the data at The Smithonian 3 times?
The world's top 500 super computers can do all that and more. A few of them are able to simulate an entire universe, or make an near exact model of Earth complete with AI and weather tracking.
You see, computers can still fill an entire room, but it is by choice, and a sweet one at that.