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The former No. 1 supercomputer is Sequoia. Sequoia which is an IBM BlueGene/Q system. It's installed at the Department of Energy’s National Nuclear Security Administration at the Livermore National Laboratory.
Sequoia achieved 16.32 petaflop/s on the Linpack benchmark using 1,572,864 cores. Sequoia is the first system with one million or more cores.
Another former No. 1 on the Top500 list is Japan's K computer. It reached 10.51 Pflop/s on the Linpack benchmark using 705,024 SPARC64 processing cores.
The new Mira supercomputer at the Argonne National Laboratory ranked No. 3 on the Top 500 list. Its a new IBM/Blue Gene/Q system and hit 10.51 Pflop/s on the Linpack benchmark from 705,024 SPARC64 processing cores placed it fourth on the list.
Mira is used by from hundreds of companies, universities, and federal, state and municipal agencies.