in 1968 the company installed a control data corporation cdc 6600 mainframe computer – the first cdc 6600 installed in the united kingdom. it was generally considered to be the first successful supercomputer, outperforming its fastest predecessor, ibm 7030 stretch, by about three times. it remained the world's fastest computer from 1964 to 1969, when it relinquished that status to its successor, the cdc 7600. by 1974 sia added more processing power by installing a control data cyber-72 at victoria.