IBM 305 RAMAC: The Supercomputer That Weighed A Ton (Literally). In September 1956, IBM announced and released the IBM 305 RAMAC supercomputer. It was the first supercomputer to use magnetic disk storage. More than 1,000 systems were built and sold before the 305 RAMAC became obsolete in 1962. The machine weighed more than a ton and required multiple people to set up or move. IBM charged companies and organisations $3,200 per month for the IBM 305. That amounts to nearly $30,000 in today’s dollars. For that reason, government organisations and large corporations were the main customers of IBM’s supercomputer. Subsequent supercomputers were released by IBM. The company releases a new supercomputer every few years on average.