To The Moon

This article is from the free weekly Barron's Tech email newsletter. Sign up here to get it delivered directly to your inbox.Not Easy. Hi everyone. I'm sure you saw the news. On Tuesday, Nvidia's stock price dropped 9.5%, erasing $279 billion in shareholder value -- the largest daily market cap loss for any U.S. company ever.Since Nvidia began its tremendous AI run around the debut of ChatGPT in November 2022, the stock has soared more than six times. But the big move up has been coupled with multiple short declines.Sure enough, Nvidia has also been responsible for five of the top 10 one-day market value gains, including the largest increase ever -- a gain of $327 billion on July 31. Win some, lose some.Nvidia has said that more than 40% of its data center revenue comes from graphics processing units, or GPUs, used for large-language model inference -- the process of generating answers from those AI models. That means the rest of its sales are for training cutting-edge AI models.