IBM ends China's 5-year reign atop supercomputer rankings

IBM's Summit has been named the world's fastest supercomputer (Image Oak Ridge National Laboratory)

There’s a shake-up – and a scandal – in the Top500 ranking of the world’s most powerful supercomputers.

The US has retaken first place in the Top500 list after five years of dominance by China. Computers built by IBM for the US Department of Energy have pushed the previous to record-holders, both Chinese, into second and fourth place.

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