Samsung Electronics has reached an 80% yield on HBM4 (sixth-generation high-bandwidth memory), a milestone known as "golden yield" in the semiconductor industry that signals production maturity and profitability. The achievement comes just six months after mass production began in February 2026, when initial yields stood below 60%, and represents a dramatic acceleration—the company had originally targeted 80% yield by year-end. Samsung's turnkey approach, integrating memory, foundry, and advanced packaging units from the design stage, overcame thermal-compression non-conductive film (TC-NCF) process limitations that had challenged competitors.
With stabilized HBM4 yields, competition with SK Hynix has shifted from technology development to production capacity. Samsung's memory division EVP Kim Jae-jun stated on the Q2 2026 earnings call that HBM4 revenue in Q3 will more than triple from Q2 and account for more than 60% of total HBM revenue in H2. The company has set an internal goal of raising HBM market share to approximately 38% by year-end, matching its overall DRAM market share. UBS projects that while SK Hynix will hold the No. 1 position in 2026 with 48% HBM bit shipments, Samsung will edge ahead in 2027 at 41% versus SK Hynix's 39%.
Samsung is also accelerating HBM4E (next-generation) development: reliability test yields have reached more than 70%, advancing mass-production timelines. The company is maximizing capacity by utilizing previously idle cleanrooms at Hwaseong and Pyeongtaek facilities. This production push is expected to unlock supply for NVIDIA's Vera Rubin AI accelerator, which has been memory-constrained by the HBM bottleneck.
Market significance: Samsung's yield stabilization and planned 3x Q3 revenue growth signal the end of SK Hynix's unchallenged dominance in AI accelerator memory. The shift to a capacity-driven competition favors Samsung's vertical integration and capital-intensive manufacturing footprint. For architects shipping AI clusters, HBM supply alternatives reduce procurement risk but also signal that margin pressure on HBM prices may ease as multiple qualified suppliers scale production in parallel.