Rebounding tech stocks drove U.S. indexes higher Tuesday, a day after they tumbled on doubts about whether the artificial-intelligence frenzy really needs all the dollars being poured into it. The S&P 500 climbed 0.

Nvidia’s stock is off to a positive start after a wild Monday. Shares of the chipmaking giant were recently up about 2%, easily outpacing the slight rise in the S&P 500. The first hours of Tuesday’s session followed a start to the week that marked Nvidia’s (NVDA) worst day in years,