Samsung builds the world's first 900-layer NAND chip — but it's still a lab prototype

Samsung has created the world's first 900-layer V-NAND prototype, using a technique called Cell Multi-Bonding (CMB) to fuse two 450-layer memory modules into a single chip. The announcement, confirmed by ETNews, comes as demand for high-density storage in AI servers and data centers continues to climb. For now, though, this is a research milestone — not a product you'll see in an SSD anytime soon.

The technology

CMB works by physically bonding two fully built 450-layer stacks together rather than adding more layers through conventional vertical stacking. Samsung says this sidesteps two stubborn manufacturing problems: wafer warpage and layer misalignment, both of which get worse as layer counts climb. Alongside the bonding approach, Samsung refined its Bitline and Wordline structures to shrink the chip's footprint and cut power draw.

The 900-layer chip is a research prototype. Samsung's actual near-term production target is its V10 generation — 400-plus layers — which is expected to reach mass production in the second half of 2026. The 900-layer work is better read as a signal of where the technology is headed, with analysts at TechGenyz framing it as Samsung's long-range answer to Chinese competition. Samsung has also said it is targeting 1,000-layer NAND by 2030.

The competitive picture

Samsung is not running away with this race. SK Hynix already ships 321-layer QLC NAND in commercial volume — production started in the second half of 2025 — with 2Tb capacity, double the write speed, and 23% better power efficiency versus the previous generation. That is the chip going into real enterprise SSDs right now, and it gives SK Hynix a meaningful production lead.

China's YMTC is also pushing hard. The company has quietly shipped 294-layer NAND inside consumer products, and it is planning 300-plus-layer mass production in 2026 — all while operating under US export restrictions that limit its access to advanced chipmaking tools. Apple, Microsoft, Google, and other large cloud buyers are watching the supply picture closely, and prototype announcements carry less weight than actual H2 2026 shipment numbers.

What this means

For consumers, the 900-layer news doesn't change what's on the shelf today. Enterprise SSD prices and availability in 2026–2027 will be shaped more by whether Samsung's V10 ramps on schedule and how aggressively SK Hynix holds its production edge. The CMB prototype does show Samsung has a credible path to extreme layer counts — but credible paths and shipping chips are two different things.