There are also big differences in what relative processing power you expect of a computer. As other people have said, the changes in tech that led to the microchip increased by an incredible factor the amount of computing power that can be packed into a given volume - but it's still also true that, to a degree, that the more you have, the more you find uses for - and also that the more you want, the bigger it gets. Some computers are still the size of a room.

IBM, for example, still produces mainframe computers for commercial use that have WAY more concurrent processing power than anything you're likely to have on your desk; the current latest one, the z16, is the size of one or more large filing cupboards. As for supercomputers - the current record holder, the [Hewlett Packard Enterprise Frontier](https://en.wikipedia.org/wiki/Frontier_(supercomputer)), apparently occupies 680m^2 (7,300ft^2 ).