• Beijing's motives for the directives are not clear
• Also unclear if this is a ban or temporary measure, sources say
• US only formally approved H200 exports to China this week
• China keen to promote development of domestic chip companies

Chinese customs authorities told customs agents this week that Nvidia's H200 artificial intelligence chips are not permitted to enter China, according to three people briefed on the matter.

Chinese government officials also summoned domestic technology companies to meetings on Tuesday, where they were explicitly instructed not to purchase the chips unless necessary, two of the people and a third source said.

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