Samsung ships 12-layer HBM4 to Nvidia in February; 8-layer variants planned for 2027

Samsung and SK hynix plan to ship 8-layer HBM4 memory to Nvidia in February. That puts both of South Korea’s memory heavyweights on the same delivery calendar for the world’s most demanding chip customer.

What’s actually shipping

High-bandwidth memory, or HBM, is DRAM stacked vertically and placed right beside a processor. The “layers” are the floors in that building. More floors means more capacity per stack, but also more heat and more chances for something to go wrong during manufacturing.

HBM4 is the newest generation. Samsung began mass shipments of HBM4 to Nvidia in February 2026, aimed at the Vera Rubin AI accelerator. That early batch was mostly 12-layer stacks.

Those chips reportedly hit speeds of up to 11.7 Gbps. The JEDEC industry standard calls for 8 Gbps, so Samsung’s parts cleared the bar with plenty of room to spare.

Both companies are preparing to ramp up 8-layer HBM4 for Nvidia’s Rubin Ultra NVL systems, with volume shipments targeted around the second quarter of 2027.

Why fewer layers can be the smarter move

The research points to two drivers: thermal management and yield. Taller 12-layer stacks trap more heat and are harder to manufacture without defects.

Yield is the share of chips coming off the line that actually work. When yields are low, a supplier burns money and misses delivery targets. Shorter stacks are easier to build cleanly at scale.

The two-horse race

SK hynix is projected to supply about two-thirds of Nvidia’s HBM4 volumes, largely thanks to better yield rates.

Samsung is playing catch-up after earlier struggles with HBM3E, the previous generation. Its HBM4 yield rate is reported at around 80%, a sign the company has fixed at least some of what tripped it up last time.

One projection has Samsung’s market share rising to 28% or higher as that recovery plays out. That still leaves SK hynix firmly in front, but it turns a lopsided contest into a real competition.

Together, the two are forecast to control more than 80% of the HBM4 market by mid-2027.

What this means

For Nvidia, having both suppliers shipping 8-layer HBM4 on a similar schedule is a hedge against the oldest risk in manufacturing: depending on one vendor. If SK hynix stumbles on output, Samsung can pick up slack, and vice versa.

For Samsung, HBM4 is a chance at redemption. Reported yields around 80% and early HBM4 shipments suggest the company is back in the game. Whether that becomes the projected 28% or more share depends on sustaining those numbers through the 8-layer ramp.

For investors watching the semiconductor sector, the signals to track are fairly concrete. Watch whether February shipments go out as planned, whether yield figures hold up, and whether the volume ramp for 8-layer HBM4 lands around the second quarter of 2027 as targeted.

With two Korean companies expected to hold more than 80% of this market, the AI industry’s appetite for computing power runs through a very narrow pipe.