Nvidia reported a strong fourth-quarter with earnings of 89 cents per share and revenue of $39.33 billion, up 78% from a year ago.The company forecasts growth of about 65% in the current quarter, with expected sales of $43 billion.Nvidia's profitability improved, with a net profit of $22.09 billion in the last quarter.Despite a decline in gross margin to 73%, Nvidia's stock rose over 1% in extended trading.The company's success is tied to its next-generation GPU Blackwell, which accounted for over $11 billion in sales last quarter.The data center business unit, including Blackwell and Hopper AI chips, made up 91% of Nvidia's total revenue, rising almost tenfold in two years.Nvidia sees increasing demand for Blackwell chips primarily for AI inference, with data center revenue reaching $35.6 billion, exceeding expectations.Investors voiced concerns about competition from rivals in AI accelerators, but Nvidia remains optimistic about its market leadership.While some segments like networking equipment and gaming experienced declines, Nvidia's automotive chip sales doubled year-over-year to $570 million.Despite a 2% year-to-date stock decrease, Nvidia's stock gained momentum after the positive earnings report.