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­pgraded ­S Supercomputers Claim Top Two Spots on Top500 List

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LLNL Sierra supercomputer

IBM built Lawrence Livermore National Laboratory's Sierra supercomputer.

Credit: Randy Wong/LLNL

The US now can claim the top two machines on a list of the 500 fastest supercomputers, as Sierra, an IBM machine for nuclear weapons research at Lawrence Livermore National Laboratory, edged out a Chinese system that last year was the very fastest.

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