On July 30, 2026, Samsung Electronics announced in Seoul the successful development of sixth-generation high-bandwidth memory (HBM4) samples based on its latest 1b DRAM process node, with 30% energy efficiency improvement over the previous HBM3E and bandwidth increased to 1.5TB/s. This technological breakthrough marks a key step for Samsung in the AI-driven high-performance storage track, potentially breaking SK Hynix's leading position in the HBM market.
Technical Details: 1b DRAM Enhancement, Dual Leap in Energy Efficiency and Bandwidth
According to Samsung, HBM4 uses the company's self-developed 1b DRAM process (i.e., fifth-generation 10nm-class DRAM), achieving increased stack layers and significant power reduction through extreme ultraviolet lithography (EUV) and advanced packaging technology. Compared to HBM3E, HBM4 offers 30% better energy efficiency, bandwidth increased from 1.2TB/s to 1.5TB/s, and capacity up to 36GB per chip. Samsung plans to start mass production of HBM4 in Q1 2027 and first provide samples to AI chip makers such as NVIDIA and AMD for verification.
Samsung's memory business head said: "HBM4 is a targeted design for AI large model training and inference scenarios, not only improving data transfer rates but also reducing system complexity through built-in voltage regulators, helping customers lower total cost of ownership." This technical roadmap directly competes with SK Hynix's previously disclosed HBM4 plan, which also targets mass production in 2027 using hybrid bonding technology for higher stacking.
Industry Background: HBM Market Expands Rapidly, Supply-Demand Gap Persists
High-bandwidth memory (HBM) is a key component for AI server GPUs. With the launch of high-performance computing chips like NVIDIA Blackwell and AMD MI400, HBM demand has exploded. Market research firm Gartner predicts the global HBM market will exceed $30 billion by 2027, with a compound annual growth rate of over 50% from 2024 to 2027. However, current HBM production capacity is mainly held by SK Hynix (about 60% market share). Although Samsung Electronics entered the market in 2025 with HBM3E, its yield and customer certification progress once lagged behind.
"After completing HBM4 development on this 1b DRAM node, Samsung is expected to narrow the technology gap with SK Hynix and potentially overtake in the next generation," said US semiconductor analyst Jim Handy. "The key is whether it can achieve mass production on schedule in 2027 with a yield rate of at least 80%." Earlier, Samsung announced in June 2026 that its HBM3E products passed certification for NVIDIA's H200 GPU, securing more order share for the company.
Impact on US Stock Market: Samsung ADR Valuation Logic May Reshape
As of the US market close on July 29, Samsung Electronics' US ADR (ticker: SSNLF) closed at $1,150, up about 12% year-to-date, lower than the Philadelphia Semiconductor Index (SOX)'s 18% gain, mainly dragged down by price declines in traditional memory businesses (NAND, DDR4). After the tech breakthrough news, Samsung ADR rose 3.2% in after-hours trading, with market sentiment clearly improving.
"Samsung's valuation has always been constrained by the volatility of its memory chip cycle, but progress on HBM4 will strengthen its growth attributes in the mid-to-high-end storage segment," a JPMorgan analyst noted in a recent report, raising Samsung's target price to $1,350, implying about 17% upside. In comparison, SK Hynix ADR (HXSCL) has risen 8% since July, with a P/E ratio of 22x, reflecting a significant premium as the HBM leader.
Investment Strategy: Focus on Tech Iteration and Capacity Ramp-Up Pace
For cross-border investors, the HBM track is becoming a core focus for Asian memory chip stocks in the US market. Both Samsung Electronics and SK Hynix ADRs are tradable on US exchanges, benefiting from AI demand, but they differ in technology roadmap, customer structure, and financial leverage. Investors should focus on the following factors:
- Mass production timeline: Samsung HBM4 plans to start production in Q1 2027, while SK Hynix's HBM4 is expected for the same period; any time difference may cause short-term stock price fluctuations.
- Customer validation progress: Certification cycles with NVIDIA and AMD typically take 6-9 months; obtaining certification increases order certainty.
- Traditional memory business performance: DRAM and NAND prices showed signs of stabilization in the second half of 2026, but supply-demand dynamics have not fully reversed; Samsung's traditional business share (about 60%) may still pressure overall earnings flexibility.
Additionally, Micron Technology (MU) as a US-based memory leader is also accelerating HBM4 R&D, planning to follow with mass production in 2028. Under the three-player landscape, competition in the HBM market will intensify, and technological breakthroughs and cost control capabilities will determine long-term valuations in capital markets.
Outlook: Memory Chip Technology Roadmap Accelerates Iteration
Samsung's completion of HBM4 development is not an isolated case. Global memory chip manufacturers are engaging in an arms race around frontier technologies such as HBM, DDR5, and CXL. TrendForce's latest report shows that after DRAM contract prices fell 5% in Q3 2026, they are expected to stop declining and rebound in Q4, benefiting from AI server stocking and smartphone inventory replenishment. HBM, as a structural growth highlight, will continue to attract capital inflows.
Overall, Samsung Electronics' HBM4 technological breakthrough is a testament to its own technical strength and reflects the trend of AI storage demand moving from concept to reality. For readers of ChipView US Stocks, it is advisable to closely track subsequent mass production progress and financial verification to seize long-term investment opportunities in Asian memory chip leaders.
