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(Image: Livermore Science Center)
IBM built Sequoia, a BlueGene/Q supercomputer, which is operated by the US government at Livermore, California. Sequoia, another former leader, is now the third-fastest supercomputer.
Linpack performance (Rmax): 17,173.2 TFlop/s
Theoretical peak (Rpeak): 20,132.7 TFlop/s
Operating system: Linux