Samsung Hits ~80% HBM4 Yield and Shifts Focus to Volume

High-bandwidth memory is where AI accelerators live or die—and Samsung just told the market its sixth-generation HBM4 stack is past the scary yield curve. On September 20, 2026, Seoul Economic Daily reported that Samsung Electronics’ HBM4 yield, once below 60% early in mass production, has climbed to around 80%—a level the industry nicknames a “golden yield.”

Why yield is the real scoreboard

HBM stacks multiple DRAM dies; a defect in one layer can scrap the finished product. That makes yield the difference between “we can make HBM4” and “we can ship it profitably at scale.” SED’s reporting frames Samsung’s next move as capacity, not another process brag: demand for high-capacity, high-speed HBM is rising with accelerator performance, and suppliers that miss delivery windows leave money on the table.

Volume and mix numbers to watch

• Samsung expects third-quarter HBM4 revenue to more than triple quarter over quarter.
• HBM4 is projected to account for more than 60% of Samsung’s total HBM revenue in the second half.
• Three months after HBM4 mass-production shipments began in February, related revenue surpassed $1 billion; some observers float a path above $10 billion by year-end.
• Average monthly HBM wafer input is projected to rise nearly 40%, from about 180,000 this year to about 250,000 next year.

SED also notes HBM4 pricing around 2 million won per chip—more than double HBM3E—so mix shifts matter as much as wafer counts. Glass-carrier cleaning volume for high-stack HBM is expected to jump 2.5× (20,000→50,000 sheets/month), a back-end signal of thicker stacking roadmaps.

Share gap vs SK Hynix

Per Counterpoint Research cited by SED, Samsung’s HBM revenue share rose from 21% in Q1 to 33% in Q2, while SK Hynix slipped from 58% to 50%—closing a 37-point gap to 17 points. Samsung’s integrated memory + foundry + packaging story (1c DRAM with a 4nm-class base die) is offered as one reason yields stabilized faster.

HBM4E and the DRAM squeeze

Samsung supplied 12-layer HBM4E samples in May and began qualification; reliability-stage yield is said to be above 70%. Mass-production timing still depends on customer certification. Separately, diverting wafers into HBM can constrain commodity server/PC DRAM—potentially strengthening Samsung’s pricing leverage outside pure AI stacks.

Rocks take

Treat ~80% as an industry-sourced milestone, not a audited lab certificate. The actionable signal is Samsung pivoting from “catch Nvidia/SK on HBM tech” to “ship volume and mix.” Cross-check Seoul Economic Daily’s report before repeating year-end revenue forecasts.

FAQ

What is HBM4? Samsung’s sixth-generation high-bandwidth memory for AI accelerators.

Is 80% official Samsung guidance? SED attributes it to industry sources on September 20, 2026.