The HBM markets are now seeing a shift in momentum following the validation and production stages of HBM4, and it appears Korean memory giants will be in the spotlight this time.
Micron Faces Validation Challenges With HBM4, Giving Ample Room For Samsung to Snatch Market Share
With Vera Rubin and the Instinct MI400 series, major chip manufacturers have shifted their focus to integrating HBM4. This technological leap combines logic and memory into a single package, delivering higher performance benefits. We won't go into much depth. However, from an industry POV, the HBM market share, primarily distributed between SK hynix, Micron, and Samsung, will see a noticeable change moving ahead, given that reports suggest that with HBM4, Korean memory suppliers will see greater adoption compared to Micron, whose market share is 'rumored' to drop to 0% with this generation.
There's a lot of uncertainity around Micron's future in the HBM segment, given that SemiAnalysis has claimed the company won't see its HBM4 adopted in the Rubin lineup. Before we jump into this conclusion, it is important to understand the context, as that is what most retailers are missing. The primary reason for America's biggest DRAM manufacturer dropping out of the HBM4 race "for now" is that the company's internal HBM4 base die is facing issues with customer validation, pin speeds, and the precision of the foundry's logic.
Diving a bit deeper into the specifics, Micron internally designs the DRAM and base die with HBM4 to lower costs and gain greater control over the supply chain. Compared to competitors like Samsung (which has its own logic foundry) and SK hynix (which collaborates with partners like TSMC), Micron chose a riskier route that hasn't turned out in its favor. Since Micron is reluctant to switch to advanced nodes for the base die, this has created thermal challenges for the company and, more importantly, lower pin speeds compared to alternatives.
Micron is reportedly eying a Q2 2026 timeline for NVIDIA's qualification tests, after a redesign of the base die and tweaking PDN and PHY elements, but since Vera Rubin is in "full production", Samsung and SK hynix have an advantage this time. With this, there are multiple claims that the HBM market will see a shift in the share of memory companies, but among all those estimates, it is certain that Micron's influence will decline, giving Samsung room to grow.
SK hynix would be the primary beneficiary of NVIDIA's Vera Rubin HBM4 integration, and it is expected to gain market share above 50% in this generation. Similarly, Samsung became the first to meet NVIDIA's required pin speeds with HBM4, which is why the Korean giant is estimated to have a 20% to 30% market share, based on how Micron proceeds through its validation stages. It is also important to note that while Micron will see a drop in HBM, the company's general-purpose DRAM products are in immense demand, and, in particular, it will benefit from SOCAMM adoption.
Given Samsung's delay with HBM3, it is certainly interesting to see the firm making a return to mainstream markets, and with Micron, it appears the company will arrive late to the HBM4 party, held by Vera Rubin and MI400 series.
About the author: Muhammad Zuhair is a hardware and technology reporter for Wccftech, specializing in the semiconductor industry and the complex interplay between technology, manufacturing, and geopolitics. His coverage focuses on the corporate strategies and technological roadmaps of industry giants like TSMC, NVIDIA, Samsung, and Intel. Zuhair's expertise lies in deconstructing complex topics such as fabrication nodes (e.g., 2nm process), the economic impact of policies like the CHIPS Act, and the strategic development of AI infrastructure from NVIDIA, AMD and Intel.
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