Nvidia, which soared to the top of the stock market by selling the computer chips fueling the world’s artificial intelligence boom, has been dealt a tough reality check by a small Chinese company that showed it could do more with less of what Nvidia makes. On Monday, shares of Nvidia plunged 17 percent after the company, called DeepSeek, showed that it could train a cutting-edge A.I. system with a fraction of the Nvidia chips that had been used in the past by OpenAI, the maker of ChatGPT. The company lost roughly $600 billion in market value, on what was its worst trading day since the pandemic sell-off in March 2020.
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