The U.S. Department of Energy's Oak Ridge National Laboratory (ORNL) is now home to the world’s fastest supercomputer, according to the latest Top500 list. Aptly dubbed Titan, the Cray-built system knocked off IBM’s Sequoia after only six months in the top position, with a performance of 17.59 petaflops on the Linpack benchmark, or quadrillions of calculations per second, beating the previous record of 16.32 petaflops.