Intel and Nvidia have been blocked from selling chips to four Chinese supercomputer centers because the U.S. government has determined those computers are used for "nuclear explosive activities." TianHe-1A and TianHe-2 are among the world's fastest supercomputers. They both run almost entirely on Xeon processors made by Intel. TianHe-1A also uses chips from Nvidia.
But now neither Intel nor Nvidia may sell their chips to four institutions in China that run these colossal machines.