Advanced Micro Devices (AMD) stock (NASDAQ: AMD) fell 9% before the bell on Wednesday after the company fell short on sales for its data centers, despite reporting better-than-expected fourth-quarter earnings. (The stock is down 7% as of midday Wednesday.)Thats because the chipmakers core business is selling data center chips for graphics processing units used to power AI. Its currently going head-to-head with Nvidia for market share of the lucrative, high-powered AI chip market.Shares in Nvidia(NVDA), meanwhile, were up 4% in midday trading Wednesday after Googles parent company,Alphabet, announced it will spend $75 billion in expected capital expenditures in 2025, a majority of which will go into building data centers and servers in an effort to help Google increase its AI capabilities.On Tuesday, AMD reported Q4 revenue that came in at $7.66 billion, beating estimates of $7.54 billion, and an adjusted earnings per share (EPS) of $1.09. Looking ahead to the first quarter of 2025, the chipmaker forecast revenue coming in between $6.8 billion and $7.4 billion.On its earnings call with investors, CEO Lisa T. Su told investors the company sees strong double-digit percentage revenue and EPS growth for 2025, calling 2024 a transformative year for AMD . . . [when we] successfully established our multibillion-dollar data center AI franchise, launched a broad set of leadership products, and gained significant server and PC market share.Also on Wednesday, Truist Securities analyst William Stein reduced the companys price target to $130 a share, down from $145. At the time of this writing, AMD stock was trading at $109.58, near its 52-week low.