Updates with close of trading session

By Noel Randewich

Feb 18 (Reuters) - The S&P 500 ended higher on Wednesday, lifted by gains in Nvidia, Amazon and other technology-related heavyweights following recent jitters about artificial intelligence.

Nvidia NVDA.O climbed after the world's most valuable company said it had signed a multi-year deal to sell to Meta Platforms META.O millions of its current and future AI chips.

Sandisk SNDK.O, Western Digital WDC.O and Seagate Technology Holdings STX.O climbed for much of the session, adding to strong gains in recent months fueled by massive AI-related demand for their storage technology.

AI-related stocks lost ground earlier this month as investors worried about high valuations and how long it might take for AI investments to boost revenue growth.

Amazon AMZN.O and Microsoft MSFT.O rose on Wednesday.

"At a certain point, weakness in tech was bound to bring in the marginal buyer. These are still high-growth names. They were expensive and they've gotten cheaper," said Ross Mayfield, an investment strategy analyst at Baird in Louisville, Kentucky. "There are still a lot of people who want to be exposed to tech for the next several years."

Software makers also showed signs of recovery following recent worries that improved AI tools could lead to more competition and squeeze their profit margins.

The S&P 500 software and services sector .SPLRCIS increased after tumbling earlier this month. It was helped by advancing Cadence Design Systems CDNS.O shares, after the chip-design software provider beat fourth-quarter revenue estimates.

Palo Alto Networks PANW.O dropped after trimming its annual profit forecast.

According to preliminary data, the S&P 500 .SPX gained 37.05 points, or 0.56%, to end at 6,880.27 points, while the Nasdaq Composite .IXIC gained 170.88 points, or 0.76%, to 22,749.27. The Dow Jones Industrial Average .DJI rose 123.44 points, or 0.25%, to 49,656.63.

Federal Reserve officials were in nearly unanimous agreement to keep interest rates on hold at their meeting last month, but remained split over what might happen next, according to minutes of their January 27-28 meeting released on Wednesday.

Traders are pricing in a roughly 50% chance of a rate cut of at least 25 basis points by the Fed's June meeting, according to CME's FedWatch Tool.

Data released on Wednesday showed solid business spending and U.S. economic growth in the fourth quarter.

Analog Devices ADI.O rose after the chipmaker forecast second-quarter results above Wall Street estimates.

Global Payments GPN.N jumped after the payment technology firm projected annual adjusted profit above expectations.

Moderna MRNA.O climbed after the U.S. Food and Drug Administration agreed to review its influenza vaccine, reversing an earlier decision rejecting the application.

(Reporting by Shashwat Chauhan and Twesha Dikshit in Bengaluru, and by Noel Randewich in San Francisco; Editing by Pooja Desai, Saumyadeb Chakrabarty, Rod Nickel)

((noel.randewich@thomsonreuters.com))