Sandisk and SK hynix release standard specifications for High Bandwidth Flash (HBF) through OCP
At FMS 2026, SanDisk and SK hynix released initial High Bandwidth Flash (HBF) standard specifications via the Open Compute Project, aiming to support AI inference by positioning HBF between HBM and SSDs. The spec targets up to 512GB capacity and 0.4 to 3.0TB/s bandwidth grades using UCIe. SK hynix also showcased its 375-layer V10 4D NAND, citing 2.5x performance-per-watt.
How this was made
The 30-second read
Why it matters
The article’s actionable content is the first published HBF specifications (capacity up to 512GB, bandwidth grades 0.4 to 3.0 TB/s, UCIe host interconnect) and SK hynix’s 375-layer V10 4D NAND prototype performance-per-watt claim (2.5x) with enterprise SSD mass production planned for early next year.
Market read
Traders may view this as a standards and roadmap signal for AI memory tiering, but the article lacks direct financial metrics, customer adoption, or contract awards.
What to watch
Interoperability success depends on ecosystem validation, software enablement, and whether HBF can meet reliability and cost targets versus incremental HBM and faster SSD/PCIe approaches.
Background
HBF is positioned as a memory layer between HBM and SSDs, published as an open standard through OCP after an OCP workstream and a Sandisk-SK hynix partnership.
Ticker impact
Sandisk is releasing the first open High Bandwidth Flash (HBF) specifications via OCP, targeting AI inference bandwidth and capacity constraints.
Modest positive bias for sentiment, with limited immediate earnings impact until prototypes move to mass production.
The article discloses a standards release and ecosystem push, plus Sandisk’s role in keynotes and joint panels, but provides no revenue, customer, or production volume commitments.
Market effects
Could shift AI memory architecture toward tiered designs combining HBM-like bandwidth with NAND density, potentially affecting competitive positioning across memory and SSD suppliers.
Primarily US-listed sentiment spillover for Sandisk, with broader global read-through to Asian memory supply chains.
OCP open standardization may influence global hyperscaler and accelerator ecosystem integration timelines for AI inference hardware.
Counterpoint
Open standards do not guarantee adoption; without named customer designs, volume commitments, or pricing, the impact may remain speculative.
Key entities
- standards_bodyOpen Compute Project (OCP)
Publishes the HBF specifications as an open standard to drive ecosystem interoperability.
- technologyHigh Bandwidth Flash (HBF)
A tiered memory concept combining high-speed transfer with high-density NAND for AI inference workloads.
- product_technologySK hynix 375-layer V10 4D NAND
Next-gen NAND prototype with claimed 2.5x performance-per-watt improvement and enterprise SSD mass production timing.
- companySandisk
Co-releases HBF open specifications and presents system-level AI inference NAND optimization at FMS 2026.
