SK hynix Delivers HBM4E Samples, Intensifying AI Memory Race
South Korean semiconductor giant SK hynix has officially shipped samples of its 12-layer HBM4E (High Bandwidth Memory 4E) to key customers, marking a significant step in the ongoing artificial intelligence (AI) memory race. The development comes roughly three weeks after rival Samsung Electronics claimed the industry's first such shipment, as reported by The Korea Herald on Thursday.
Improved Performance and Efficiency
According to SK hynix, the new 12-layer HBM4E delivers a 20% improvement in energy efficiency compared to the previous HBM4 generation. The memory module offers 48 gigabytes of capacity and pin speeds of up to 16 gigabits per second. This advancement positions SK hynix to meet the growing demands of AI training and inference workloads.
Advanced Packaging Technology
SK hynix has applied its proprietary Advanced MR-MUF (Mass Reflow Molded Underfill) packaging process to the HBM4E. This technique reduces gaps between stacked chips using a protective material, enhancing structural stability and heat dissipation. The company claims the process lowers thermal resistance by nearly 17% compared to HBM4, a critical achievement as faster memory generates more heat in dense computing environments.
Customer Validation Phase
In the high-bandwidth memory market, where memory is packaged alongside GPUs to alleviate data bottlenecks in AI tasks, sample delivery marks the entry point for customer validation rather than proof of mass production. This stage is particularly significant for HBM4E because the generation is moving toward more customized designs, with logic base dies tailored to individual customers. Early validation slots are thus highly valuable.
An industry official noted, as reported by The Korea Herald, "To be clear, both companies have only shipped samples so far. Neither company has said it has cleared customer qualification or begun volume production, the stages that will decide which supplier locks in orders for next year's AI platforms."
Market Leadership
According to Counterpoint Research, as of the first quarter of 2026, SK hynix leads the HBM market with a revenue share of approximately 58%. Samsung and Micron trail with roughly 21% each. The sample shipment underscores SK hynix's commitment to maintaining its competitive edge in the rapidly evolving AI memory sector.
