Nvidia Corp., one of the hottest stocks in the U.S., has become more volatile than even bitcoin as the artificial intelligence boom has propelled it. The company’s shares, which had surged as companies in the industry spent money to buy its chips, fell 7% on Tuesday, the biggest drop in more than three months, wiping out $193 billion from its market value. Nvidia’s stock has fallen 23% since July 10, a reversal that highlights a risk that wasn’t on the radar when the stock was rising: Its volatility is about twice that of bitcoin, at least by one key measure. Despite this month’s pullback, Nvidia is still up about 109% this year, more than any other stock in the S&P 500 except for Super Micro Computer Inc., another company that has benefited from investments in equipment for AI applications.