<ul><li>Nvidia expects to take a $5.5bn hit as US tightens AI chip export rules to China.</li><li>The company's H20 AI chip, designed for the Chinese market, now requires a special license to sell in China.</li><li>The US government aims to address the risk of Nvidia's products being used in or diverted to supercomputers in China.</li><li>Nvidia's shares dropped about 6% in after-hours trading, potentially impacting its market value.</li></ul>

Nvidia expects to take $5.5bn hit as US tightens AI chip export rules to China

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