IBM's Sequoia supercomputer in June became the first U.S.-based system to reach No. 1 on the Top500 list of the world's fastest supercomputers. Six months later, the system-at Lawrence Livermore Laboratory-was moved to No. 2, displaced by Cray's huge Titan supercomputer, housed at the Oak Ridge National Laboratory in Tennessee. Titan, a massive XK7 system powered by Opteron processors from Advanced Micro Devices and GPU accelerators from Nvidia, hit a performance of 17.59 petaflops-or quadrillions of calculations per second-outdistancing Sequoia's 16.32 petaflops.
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