Samsung HBM4 Yield Rises to Nearly 80%, Intensifying Capacity Competition with SK Hynix
Alina Collins
Samsung's HBM4 yield has risen from under 60% at mass-production launch to nearly 80%, months ahead of industry expectations; SK Hynix sits in the same 80% range, shifting the battle from specs to capacity and delivery reliability.
What does 80% yield actually mean?
Samsung's HBM4 yield — the share of usable chips per production batch — jumped from under 60% to nearly 80% within roughly half a year, the Seoul Economic Daily reported on August 10, citing industry sources.
This means → Samsung's mass-production bottleneck is clearing fast. More good chips per wafer drives unit costs down and unlocks higher shipment volumes.
SK Hynix has reached the same 80% range. The two Korean memory giants now stand on level ground — competition has moved from "who builds it first" to "who ships it at scale, on time."
How is Samsung closing the gap?
HBM4 uses Samsung's sixth-generation 1c DRAM process paired with a 4 nm logic base die, delivering a stable 11.7 Gbps data rate expandable to 13 Gbps.
In plain terms = Samsung links its memory fabs and foundry under one roof, co-optimizing the design from the start and running packaging in-house — shortening the chip-to-finished-product cycle.
On capacity, Samsung is activating idle cleanrooms at its Hwaseong campus for DRAM expansion while adding HBM-dedicated 1c DRAM lines at its Pyeongtaek P4 fab. Additional Pyeongtaek facilities are already being prepared.
Can Q3 revenue really triple?
Samsung expects HBM4 revenue to more than triple quarter-on-quarter in Q3, a pace that could pull its HBM market share closer to its overall DRAM share.
This means → if delivered, Samsung shifts from HBM underdog to a direct, head-to-head competitor against SK Hynix in high-bandwidth memory.
Reuters separately reported that Samsung sees a broader chip shortage lasting through 2028. This reflects a demand picture where HBM appetite is not slowing — the supply gap may keep widening.
HBM4E — who leads the next round?
Samsung began sampling 12-layer HBM4E to key global customers in May: stable speed of 14 Gbps per pin, expandable to 16 Gbps, with per-stack bandwidth of 3.6 TB/s and 48 GB capacity.
Compared with HBM4, HBM4E delivers 16% better energy efficiency and over 14% lower thermal resistance, using the same 1c DRAM + 4 nm logic base die combination.
SK Hynix followed in June with its own 12-layer HBM4E sample at up to 16 Gbps per pin. Its Advanced MR-MUF packaging — a process that bonds multiple chip layers with a specialized material to improve heat dissipation — cuts thermal resistance by 17%.
What to watch next?
With both suppliers at 80% yield, large-scale reliable delivery becomes the variable that shapes the next phase of the HBM market.
In plain terms = the specs are nearly identical now. Whoever fills the production lines first and ships on time and in volume wins the orders.
The nearest proof points: whether Samsung's Q3 HBM4 shipments can back up the "triple revenue" forecast, and whether HBM4E mass-production timelines stay on track.
Content is for reference only, not financial advice.