U.S. supercomputers are now ranked in first and second place on the latest Top500 list, due to upgrades.
The Sierra system at the Lawrence Livermore National Laboratory attained second place on the newest list, dethroning the Chinese Sunway TaihuLight that previously held the top spot for two years.
The Summit system at the U.S. Department of Energy's Oak Ridge National Laboratory claimed the top spot in June with a speed of 122.3 petaflops, but has since been upgraded to 143.5 petaflops.
Both Sierra and Summit use IBM Power9 processors with Nvidia Tesla V100 accelerator chips and Mellanox high-speed Infiniband network links, with Summit featuring 2.4-million processor cores to Sierra's 1.6-million.
China still dominates the Top500 list with 227 supercomputers, versus the U.S.' 109.
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