A Supercomputer can perform trillions of commands within a second. If you put a Supercomputer in comparison to a general-purpose PC, it would prove to be a million times faster than the latter. To make it more interesting, a human brain will take millions of years to do the calculations that a Supercomputer does within a second. And there are some Supercomputers that are so fast that a human brain will take billions of years to calculate the data they do within a second.