TOKYO (AFP) - A Japanese supercomputer has broken its own record as the worlds fastest machine by performing 10 quadrillion calculations per second, its developers announced. The K Computer, which has more than 88,000 central processing units the computers brain compared with the fewer than four in the average desktop, smashed its own record of just over 8 quadrillion calculations during an experiment in October. A quadrillion is a thousand trillion. Supercomputers operate roughly 10,000 times faster than ordinary personal computers.