# AMD Stock After Q3 2026 Earnings: Its AI Chips Earn Less Than Its Average — InvestMoat Research

_AMD's data center sales nearly doubled in Q3 2026, but its CFO says the AI GPU margin sits below the company average. I think AMD prices its AI chips like a custom-chip maker without the custom-chip lock-in, so it's winning volume as the second source and hasn't yet shown a moat._

_Published: November 6, 2026 · Last reviewed: November 6, 2026 · Canonical page: https://www.investmoat.com/research/amd-q3-and-the-ai-margin-below-its-own-average_
_Tags: Semiconductors, AI Infrastructure, Pricing Power, Earnings_
_Covers: AMD, NVDA, AVGO, MRVL_

## Summary

AMD reported Q3 2026 on November 3: revenue of $13.4 billion, Data Center up 97% to $8.5 billion, and a forecast of more than 80% revenue growth in 2027. Its CFO also said the data center AI business carries a gross margin a little below AMD's corporate average of 56%. Every AI chip seller except Nvidia now reports that AI dilutes its gross margin, Broadcom included, because the memory on these chips is expensive and only Nvidia's software lets it charge well above that cost. Broadcom and Marvell make up for it with chips co-designed into one buyer's systems for years. AMD sells a merchant GPU on cost of ownership, so I read its growth as a second source winning volume rather than a moat, and I'd change my mind if AMD says its AI margin has reached the company average by early 2028.

## What would prove this wrong

If, by its Q4 2027 earnings call (around early February 2028), AMD says its data center AI gross margin is at or above the corporate average, or reports a non-GAAP gross margin of 58% or more in a quarter where it says data center AI grew faster than server CPUs, then AMD's AI chips are earning a price a second source wouldn't get, and I've undersold the moat.

_Status as of November 6, 2026: **holding**._

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Data Center revenue, Q3 2026: +97% YoY · AMD gross margin, Q3 2026: 56% · Nvidia gross margin, latest quarter: 75.0% · AMD price: (live)

**I think AMD is winning AI as the cheaper second source, the supplier big buyers keep so they aren't stuck paying Nvidia's price, and that isn't a moat yet.** Data Center sales nearly doubled in Q3 and Lisa Su now expects total revenue to grow more than 80% in 2027. But asked about margins as Helios, AMD's full-rack AI system, ramps up, [CFO Jean Hu said](https://404kresearch.substack.com/p/amd-third-quarter-2026-earnings-call) the AI business carries "a margin a little bit dilutive to corporate average, but the gross margin dollars are increasing very significantly."

Gross margin is what's left of each sales dollar after the cost of making the chip. AMD's company average is 56%. Nvidia sells almost nothing but data center chips, so its 75% is close to its AI margin. AMD's AI chips sit somewhere below 56%. That's a wide gap on chips that do the same job.

## AMD's mix moved to data center and its margin stayed put

**Data Center's share of AMD revenue rose about 17 points in a year while gross margin stayed in the mid 50s. Q4 2025's 57% included a one-time inventory reserve release, and AMD said it was about 55% without that and its MI308 sales to China. Share is my calculation from AMD's segment tables. The Q4 2026 point is guidance.**

| Period | Data Center share of revenue | Non-GAAP gross margin |
| --- | --- | --- |
| Q3 2025 | 47% | 54% |
| Q4 2025 | 52.4% | 57% |
| Q1 2026 | 56.3% | 55% |
| Q2 2026 | 58.2% | 56% |
| Q3 2026 | 63.9% | 56% |
| Q4 2026 guide | — | 55% |

Q4 2025: One-time reserve release; Q3 2026: MI450 ships in volume.

_Figures as of Q3 2026. Source: [AMD Reports Third Quarter 2026 Financial Results](https://ir.amd.com/news-events/press-releases/detail/1303/amd-reports-third-quarter-2026-financial-results); [AMD Reports Second Quarter 2026 Financial Results](https://ir.amd.com/news-events/press-releases/detail/1295/amd-reports-second-quarter-2026-financial-results); [AMD Reports First Quarter 2026 Financial Results](https://d1io3yog0oux5.cloudfront.net/_530b22e8aa311a8d1011a56b31890d4b/amd/news/2026-05-05_AMD_Reports_First_Quarter_2026_Financial_1284.pdf); [AMD Reports Fourth Quarter and Full Year 2025 Financial Results](https://ir.amd.com/news-events/press-releases/detail/1276/amd-reports-fourth-quarter-and-full-year-2025-financial)._

Two things pull against each other inside that flat line. EPYC server CPUs are AMD's richest products, and Su expects server revenue to double in 2027. The Instinct GPUs are, in Hu's words, below average. Data Center's operating margin, which also takes out research and sales costs, rose from about 25% to about 34% over the year. I think most of that is costs growing slower than sales, since Hu says 2027 operating costs will grow at less than half the rate of revenue. That's a bigger business, and it doesn't show the GPUs fetching a better price.

## AI dilutes everyone's margin except Nvidia's

AMD isn't alone. Broadcom, whose custom chips for Google and others are the other way off Nvidia, told investors the same thing in September.

**Gross margin as AI grows inside the three largest AI chip sellers, each at its latest reported quarter. Broadcom's figures are company-wide and include its software business.**

| Company and quarter | AI or data center revenue | Gross margin now | Next quarter guide | What management says AI does to it |
| --- | --- | --- | --- | --- |
| AMD, Q3 2026 (to Sep 26) | Data Center $8.5B, +97% | 56% | About 55% | AI is "a little bit dilutive to corporate average" |
| Nvidia, Q2 FY2027 (to Jul 26) | Data Center $89.0B, +117% | 75.0%, from 72.5% a year earlier | 74.0%, plus or minus 0.5 pt | Rose over the year as data center grew |
| Broadcom, Q3 FY2026 (to Aug 2) | AI semiconductors $16.7B, +221% | 75%, down 2.1 pts in a quarter | About 73%, from 78% a year earlier | Custom chips with "increasing memory content" are "diluting" it |

_Figures as of November 2026. Source: [AMD Reports Third Quarter 2026 Financial Results](https://ir.amd.com/news-events/press-releases/detail/1303/amd-reports-third-quarter-2026-financial-results); [AMD third quarter 2026 earnings call transcript (compiled)](https://404kresearch.substack.com/p/amd-third-quarter-2026-earnings-call); [NVIDIA Announces Financial Results for Second Quarter Fiscal 2027 (release as republished)](https://finviz.com/news/385939/nvidia-announces-financial-results-for-second-quarter-fiscal-2027); [Broadcom Inc. Announces Third Quarter Fiscal Year 2026 Financial Results](https://investors.broadcom.com/node/64671/pdf); [Broadcom Q3 2026 earnings call transcript](https://www.webull.com/news/15511095937917952)._

Every one of these chips carries stacks of expensive high-bandwidth memory. Broadcom and AMD earn a margin on top of that memory that shrinks the more of it they ship. Nvidia ships the same memory and its margin went up. **The difference is how much the seller can charge above its costs, and that's the moat.** Nvidia gets it from CUDA, the software AI developers have spent fifteen years learning and building on, which makes leaving expensive even when a rival chip is cheaper.

Broadcom has a different answer, and Hock Tan gave it on the call: "stop focusing on gross margin." Its custom chips are designed with one buyer over several generations, so the revenue is locked in and its operating costs barely rise with it. Its CFO said operating margin rose 2.4 points over the year to 67.9%, even as gross margin fell. Broadcom accepts a thinner margin on each chip in exchange for being built into the buyer's systems for years, and Marvell sells custom chips the same way on a smaller scale.

> **INSIGHT** — A test for any AI chip seller: if AI growth pulls its gross margin down, ask what makes up for it. Nvidia has the software. Broadcom and Marvell have years-long designs with one buyer. A seller with neither is being paid to be the alternative.

## AMD sells on cost, and bought its biggest contract

Asked how AI labs choose between AMD and their own custom chips, Su didn't talk about software. She said "the key is for us to continue to show that TCO advantage across workloads," meaning total cost of ownership. That's a price-for-performance pitch. It's working: Anthropic, Meta, Microsoft, OpenAI and Oracle all have brought their first Helios racks online, Su said, and quickly. But a buyer who chose you on cost runs the comparison again at the next order.

AMD's closest thing to Broadcom's lock-in is OpenAI's multi-year deal for 6 gigawatts of GPUs, gigawatts being how AI buyers now size data centers by the power they draw. AMD [paid for that with equity](https://d1io3yog0oux5.cloudfront.net/_be34f20d01abfe28aeec9c2c12afe601/amd/news/2025-10-06_AMD_and_OpenAI_Announce_Strategic_Partnership_to_1260.pdf): a warrant for up to 160 million AMD shares that vests as OpenAI's purchases scale and as AMD's share price hits set targets. A supplier with pricing power doesn't hand its biggest customer stock to buy from it.

The grid below is InvestMoat's live rating of where each company's moat comes from. Learned interfaces and network effects are the software habit and the developer community. Transaction embedding is how deeply the product is wired into a customer's operations. Bundling is selling the pieces as one package.

**Live pillar ratings for the two merchant GPU makers and the two custom-chip partners.**

| Ticker | Learned Interfaces | Network Effects | Transaction Embedding | Bundling |
| --- | --- | --- | --- | --- |
| [AMD](https://www.investmoat.com/stocks/amd) | weakened | weakened | intact | intact |
| [NVDA](https://www.investmoat.com/stocks/nvda) | strong | strong | strong | intact |
| [AVGO](https://www.investmoat.com/stocks/avgo) | intact | weakened | strong | strong |
| [MRVL](https://www.investmoat.com/stocks/mrvl) | na | na | strong | intact |

Nvidia is rated strongest where the software lives. Broadcom and Marvell are rated strongest on embedding, which is where their co-designed chips come from. AMD is rated below Nvidia on the software rows and below the custom-chip makers on embedding. It has a real rack-level bundle, but nothing yet that makes a buyer pay more to stay.

## Why the dilution could be a ramp and a shortage

The strongest objection is timing. MI450 only started shipping in volume this quarter, and first-year racks carry yield, assembly and memory costs that fall as production matures. If AMD's AI margin climbs through 2027, I'm reading a launch cost as a pricing problem. The bull would add that memory is a cost every seller passes through. Su said AMD is working with customers "to ensure that those costs are shared," and Broadcom's own margin is falling for the same reason, so a lower percentage may be mostly memory.

Second, Su said "demand is higher than supply." A seller that can't make enough isn't obviously discounting. And being the second source has real value. Every large buyer wants one, AMD is the only merchant GPU maker at gigawatt scale, and Su argues GPUs have "more fungibility" than custom chips, which matters to a lab that doesn't know what next year's model needs. Hu's point stands too: gross margin dollars are rising fast, and a company can compound for years as the indispensable alternative without Nvidia's margin.

Here's why I still hold the view. Nvidia's own ramp dip was small. Its margin was 72.5% a year ago and is 75.0% now, so a full Nvidia-style recovery still leaves AMD's AI chips far behind. If memory explained the whole gap, Nvidia's margin would be sliding too, and instead it rose over the year and is guided down only about a point. Selling out in a shortage proves demand for AI chips, not that buyers would pay AMD more once supply catches up. And buyers keep a second source because it holds Nvidia's price down, which also limits what that second source can charge.

> **RISK** — What breaks this: AMD saying by early 2028 that its data center AI margin has reached the corporate average, or a non-GAAP gross margin of 58% or more in a quarter where AI outgrew server CPUs. The second condition matters because EPYC alone could lift the average without the GPUs earning more.

## What AMD says about its AI margin in 2027

This isn't a price call. The scorecard carries the live valuation and [the AMD page](/stocks/amd) the scenarios. Su expects data center to be more than 80% of AMD's revenue in 2027, so the company margin will increasingly be the data center margin. If it stays in the mid 50s while AI keeps outgrowing servers, AMD is selling volume at a second source's price. If AMD starts saying its AI margin is above average, a moat is forming.

**InvestMoat's live scores for the same four names.**

| Ticker | Name | Moat | Growth | Valuation | Composite | Note |
| --- | --- | --- | --- | --- | --- | --- |
| [AMD](https://www.investmoat.com/stocks/amd) | Advanced Micro Devices | 53 | 87 | 72 | 70 | Data Center +97%; AI margin below company average (Q3 2026) |
| [NVDA](https://www.investmoat.com/stocks/nvda) | NVIDIA Corp. | 81 | 91 | 79 | 88 | Gross margin 75.0%, up from 72.5% a year earlier |
| [AVGO](https://www.investmoat.com/stocks/avgo) | Broadcom Inc. | 70 | 89 | 82 | 83 | Gross margin guided to about 73% on custom-chip memory |
| [MRVL](https://www.investmoat.com/stocks/mrvl) | Marvell Technology | 70 | 83 | 86 | 83 | Custom-silicon and interconnect partner |

_Valuation and composite above use each asset's static valuation score; the live site recomputes them against the current market price._

## Sources

1. [AMD Reports Third Quarter 2026 Financial Results](https://ir.amd.com/news-events/press-releases/detail/1303/amd-reports-third-quarter-2026-financial-results) — AMD, November 3, 2026 (press-release)
2. [AMD Reports Second Quarter 2026 Financial Results](https://ir.amd.com/news-events/press-releases/detail/1295/amd-reports-second-quarter-2026-financial-results) — AMD, August 4, 2026 (press-release)
3. [AMD Reports First Quarter 2026 Financial Results](https://d1io3yog0oux5.cloudfront.net/_530b22e8aa311a8d1011a56b31890d4b/amd/news/2026-05-05_AMD_Reports_First_Quarter_2026_Financial_1284.pdf) — AMD, May 5, 2026 (press-release)
4. [AMD Reports Fourth Quarter and Full Year 2025 Financial Results](https://ir.amd.com/news-events/press-releases/detail/1276/amd-reports-fourth-quarter-and-full-year-2025-financial) — AMD, February 3, 2026 (press-release)
5. [AMD third quarter 2026 earnings call transcript (compiled)](https://404kresearch.substack.com/p/amd-third-quarter-2026-earnings-call) — 456X Semi-AI (Substack), November 3, 2026 (third-party)
6. [NVIDIA Announces Financial Results for Second Quarter Fiscal 2027 (release as republished)](https://finviz.com/news/385939/nvidia-announces-financial-results-for-second-quarter-fiscal-2027) — Finviz, August 26, 2026 (third-party)
7. [Broadcom Inc. Announces Third Quarter Fiscal Year 2026 Financial Results](https://investors.broadcom.com/node/64671/pdf) — Broadcom, September 2, 2026 (press-release)
8. [Broadcom Q3 2026 earnings call transcript](https://www.webull.com/news/15511095937917952) — Benzinga via Webull, September 2, 2026 (transcript)

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