AMD vs. Marvell Technology: Which AI Chip Stock Is a Better Buy in 2026?

In July 2026, Marvell signed an agreement with Google, a unit of Alphabet (NASDAQ:GOOGL), to develop custom chips, including AI inference accelerators.The race for AI infrastructure supremacy continues to reshape the market as investors weigh high-growth chipmakers. Choosing between Advanced Micro Devices (NASDAQ:AMD) and Marvell Technology (NASDAQ:MRVL) requires a close look at their recent performance and valuation. Advanced Micro Devices has grown from a PC chipmaker into a company whose largest segment is data center chips. Marvell specializes in the cloud's networking and storage backbone. Both companies benefit from the massive shift toward artificial intelligence, but they address different layers of the semiconductor landscape, offering unique risk-reward profiles for your portfolio. The case for Advanced Micro Devices Advanced Micro Devices designs high-performance computing products for data centers, gaming consoles, and personal computers. Its Instinct line of accelerators competes directly in the artificial intelligence market, making it a key player among semiconductor stocks. The company also supplies the custom chips inside the Xbox Series X and S consoles from Microsoft (NASDAQ:MSFT). Its annual report warns that it depends on a small number of customers for a substantial portion of its business, which adds a layer of risk. In the fiscal year ended Dec. 27, 2025, revenue reached nearly $34.6 billion, up about 34.3% from the prior fiscal year. The company reported net income from continuing operations of roughly $4.3 billion during this period, a net margin of approximately 12.3%. Those results absorbed about $440 million in net inventory and related charges tied to U.S. export controls on its MI308 chips for China. Data center revenue rose 32% on demand for EPYC server processors and Instinct GPUs. Client and gaming revenue grew 51%, and embedded revenue slipped 3%. Based on total debt, the debt-to-equity ratio was about 0.05x as of Dec. 27, 2025, meaning the company had very little debt relative to its equity. AMD sold $4.75 billion of senior notes in August 2026 for general corporate purposes, which may include debt repayment, so its debt load has grown, though it remains small relative to its equity. The current ratio was roughly 2.9x as of Dec. 27, 2025, which measures a company's ability to cover short-term debts with short-term assets. Free cash flow, a non-GAAP figure AMD calculates from the operating cash flow of continuing operations minus capital expenditures, was about $5.5 billion in the fiscal year ended Dec. 27, 2025. Note that stock-based compensation represented roughly 25.2% of operating cash flow from continuing operations, which inflates reported cash generation since SBC is a non-cash expense added back in the cash flow statement. Investors should also weigh potential dilution. AMD has issued warrants for up to 160 million shares each to OpenAI and Meta Platforms (NASDAQ:META), together roughly a fifth of its current share count. As of June 27, 2026, none of those shares had vested. They vest as each customer's GPU purchases hit set milestones, subject to other technical and commercial conditions. The warrants also include stock price thresholds that cap at $600 per share for the final tranche, a level AMD's stock already trades above. AMD also agreed in September 2026 to buy World Labs, an AI research lab led by Fei-Fei Li, in an all-stock deal valued at about $8.2 billion. That purchase, expected to close by the end of 2026, would add more shares on top of the warrants, and Li would join AMD as chief scientist. The case for Marvell Technology Marvell Technology operates as a fabless semiconductor firm, meaning it designs chips but outsources the actual manufacturing to partners. It focuses on data infrastructure solutions, particularly custom silicon and high-speed networking hardware for cloud providers. In July 2026, Marvell signed an agreement with Google, a unit of Alphabet (NASDAQ:GOOGL), to develop custom chips, including AI inference accelerators. As part of the deal, Marvell issued Google a warrant in August for up to about 59 million shares, roughly 7% of its share count, that vests chiefly as Google's custom chip purchases grow. Customer concentration is a factor here, as the top 10 customers accounted for 82% of total net revenue in fiscal 2026. In the fiscal year ended Jan. 31, 2026, revenue reached nearly $8.2 billion, up about 42.1% year over year, which management attributed to AI demand in its data center business. The company reported net income of roughly $2.7 billion, a net margin of approximately 32.6%, compared with a net loss in the prior fiscal year. That swing came largely from a one-time pre-tax gain of about $1.8 billion on the August 2025 sale of its automotive Ethernet business. GAAP operating margin, which excludes that gain, was about 16%. Based on total debt, the debt-to-equity ratio was approximately 0.3x as of Jan. 31, 2026. Its current ratio was approximately 2.0x as of Jan. 31, 2026, indicating it has about twice the short-term assets needed to pay its current liabilities. Free cash flow for the fiscal year ended Jan. 31, 2026, was nearly $1.4 billion. Stock-based compensation accounted for roughly 33.8% of operating cash flow, inflating reported cash generation because SBC is a non-cash expense added back in the cash flow statement. Risk profile comparison Advanced Micro Devices faces intense competition from Intel (NASDAQ:INTC) and Nvidia (NASDAQ:NVDA), which can use their massive scale to pressure pricing. The company also faces significant geopolitical risks, particularly U.S. export controls on advanced chips to China. Furthermore, relying on Taiwan Semiconductor Manufacturing (NYSE:TSM)for all of its processor and GPU wafers at 7 nanometers or smaller creates geographic concentration risk regarding potential regional disruptions. Marvell Technology has a high revenue concentration, with one distributor accounting for about 37% of its fiscal 2026 net revenue. It also faces competitive pressure from Broadcom (NASDAQ:AVGO) and Qualcomm (NASDAQ:QCOM), as well as rivals like Nvidia and Intel. Integrating Celestial AI and XConn Technologies, two acquisitions that closed in February 2026 after its fiscal year ended, and managing export controls are ongoing challenges that could affect future operational results. Valuation comparison Marvell carries the lower forward earnings multiple in the table below, and the two stocks trade at nearly identical sales multiples. The Forward P/E compares a stock price to future earnings estimates. The P/S ratio measures market value against sales over the past twelve months. Valuation metrics include sourcing from Financial Modeling Prep (FMP) and may differ from other data providers. Which stock would I buy in 2026? I'd lean toward AMD, though its warrants tied to OpenAI and Meta carry costs for shareholders. If every tranche vests, those warrants would add roughly a fifth to AMD's share count. AMD's stock already trades above the $600 price threshold set for the final tranche, so vesting now rests mainly on both customers scaling up their GPU purchases. That dilution comes paired with the growth AMD wants anyway. What tips me toward AMD is breadth. It sells its own AI accelerators and server processors to major AI spenders, and its PC chip business continues to grow. Gaming has softened, and the data center now makes up more than half of revenue. Marvell's custom chip model ties its fortunes to a small group of cloud giants, and its 10 largest customers, including distributors, accounted for more than 80% of sales last fiscal year. Its headline profit also benefited from a one-time gain from the sale of its automotive Ethernet business, so its underlying earnings power is thinner than the net margin suggests. Neither stock is cheap after huge runs, and chip demand moves in cycles, so I'd expect sharp swings along the way. Marvell trades at a lower forward earnings multiple. For investors who plan to hold for five years or more and add shares gradually, I still think AMD's broader business is worth that premium. Investors who want more direct exposure to custom AI chips and can live with heavier customer concentration may prefer Marvell. Should you buy stock in Advanced Micro Devices right now? 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Mike Schwenk has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Advanced Micro Devices, Alphabet, Broadcom, Intel, Marvell Technology, Meta Platforms, Microsoft, Nvidia, Qualcomm, and Taiwan Semiconductor Manufacturing. The Motley Fool has a disclosure policy.

AMD vs. Marvell Technology: Which AI Chip Stock Is a Better Buy in 2026?

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