# Samsung's HBM4 Yield Hits 80% in Race to Challenge SK Hynix's AI Memory Lead > Source: > Published: 2026-08-22 05:33:20+00:00 *Samsung says its HBM4 memory yield has jumped to 80%, the level chipmakers call "golden yield," arriving four months ahead of its own schedule and putting real pressure on SK Hynix's grip on the AI memory market.* According to a report from TrendForce, Samsung's HBM4 production yield crossed 80% in early August, up from below 60% when mass production began in February. Seoul Economic Daily and several other Korean outlets confirmed the figure this month. Samsung's HBM4E yield, the next step up, has already crossed 70%, according to Sammy Fans. That's fast. A yield that low in February meant most of what came off the line was scrap. A yield above 80% means the opposite: the process is stable enough to be profitable at scale. Here's why that number is the whole story. HBM4 is the memory Nvidia needs for its Vera Rubin GPU platform and AMD needs for its MI400 chips, and yield is what decides who gets paid. On June 5, Nvidia CEO Jensen Huang confirmed that Samsung, SK Hynix, and Micron had all passed certification to supply HBM4 for Vera Rubin. Passing certification gets you in the room. Yield decides how much of the order you actually walk out with, because a supplier that scraps two chips for every one it ships can't hold a price line against a rival shipping at 80%. ## SK Hynix still holds the lead SK Hynix isn't standing still. Industry tracker TrendForce estimates SK Hynix will hold around 54% of the 2026 HBM4 market, with Samsung at roughly 28% and Micron taking the rest. Other supply-chain estimates put SK Hynix's share of Nvidia's specific Vera Rubin HBM4 allocation even higher, closer to 60-70%, with Samsung capturing the bulk of what's left. SK Hynix got there first. It began HBM4 qualification earlier than its rivals and has spent the past two years as Nvidia's default memory partner, a position it built during the HBM3E generation while Samsung was still struggling to pass Nvidia's tests. Samsung didn't clear that 12-layer HBM3E qualification until September 2025, third in line behind SK Hynix and Micron. That history is exactly why an 80% HBM4 yield matters so much to Samsung. It's the clearest sign yet that the company has fixed the process problems that cost it the last generation. Samsung is now pushing hard on the momentum. The company has said it plans to triple its HBM4 revenue in the third quarter compared with the second, and it's targeting an HBM revenue share above 60% in the second half of the year. The bigger goal, according to Korean press reports, is to lift its overall HBM market share to around 38% by year-end, roughly matching the share Samsung already holds in the broader DRAM market it has dominated for decades. [SK Hynix Will Spend $38 Billion Building New Memory Chip Plants](https://startupfortune.com/sk-hynix-will-spend-38-billion-building-new-memory-chip-plants/) SK Hynix's board approved a $38.1 billion investment in two new memory chip plants in South Korea, betting that demand for HBM chips used in AI accelerators will keep outpacing supply. The move follows a record 76% operating margin and a $26.5 billion Nasdaq IPO earlier this year. - [SK Hynix 38 billion chip investment](https://startupfortune.com/sk-hynix-will-spend-38-billion-building-new-memory-chip-plants/) - [AI memory shortage chip manufacturing](https://startupfortune.com/sk-hynix-will-spend-38-billion-building-new-memory-chip-plants/) ## What comes next Frankly, the yield number alone doesn't hand Samsung the crown. SK Hynix isn't sitting on old technology waiting to get overtaken, and its own HBM4 output is reportedly improving too, even as the company deals with domestic labor negotiations that TrendForce flagged as a wildcard for its production schedule. But yield is the one lever that determines pricing power in a market where DRAM and HBM prices have already spiked hard through 2026 on AI demand. A chipmaker that can offer Nvidia or AMD more usable dies per wafer can undercut on price or simply take a bigger allocation, and either way the other two suppliers feel it. This is also a stock story, not just a technical one. Samsung, SK Hynix, and Micron all move on headlines like this because HBM has become the highest-margin part of the memory business, and every percentage point of yield translates almost directly into gross margin. AMD and Nvidia have their own stake in the outcome too. A third qualified, high-yield HBM4 supplier gives both GPU makers more room to negotiate price and secure supply for chips they've already promised to customers waiting on Vera Rubin and MI400 silicon. Samsung closing the gap doesn't guarantee it wins the next round of allocation talks. It does mean SK Hynix can no longer assume it will. **Also read:** [OpenAI Cuts GPT-5.6 Sol API Prices After Holding the Line for Months](https://startupfortune.com/openai-cuts-gpt-56-sol-api-prices-after-holding-the-line-for-months/) • [Dutch Regulator Fines Uber Nearly $1 Billion Over Automated Driver Suspensions](https://startupfortune.com/dutch-regulator-fines-uber-nearly-1-billion-over-automated-driver-suspensions/) • [Copper Hit a Record High as Congo's Export Ban Collided With AI Demand](https://startupfortune.com/copper-hit-a-record-high-as-congos-export-ban-collided-with-ai-demand/)