The U.S.’s recent denial of Intel chips for China’s fastest supercomputer could derail an upgrade to double the machine’s processing power.

China’s Tianhe-2 is the world’s fastest supercomputer with a theoretical peak speed of 54.9 petaflops. It was scheduled to be expanded, and reach a new peak speed of 100 petaflops this year.

Now those plans may be in jeopardy. The U.S. government claims the Tianhe-2 has been used in “nuclear explosive activities”, and has forbidden Intel from shipping its Xeon chips to four related Chinese supercomputing centers.

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