Samsung and SK Hynix Ship HBM4E Samples Back-to-Back as the AI Memory Arms Race Heats Up
The insatiable memory demands of AI training and inference have turned the chip industry into a sprint, and Samsung and SK Hynix just crossed the HBM4E finish line almost simultaneously.
Three key facts
Samsung announced on May 29 that it had shipped 12-layer HBM4E samples to global customers, and SK Hynix followed on June 18 with its own sample delivery. HBM4E is the most advanced high-bandwidth memory designed for AI workloads, with data transfer speeds of 16Gbps per pin — a significant leap over the previous HBM4 generation. Both products use a 12-layer stack with 48GB capacity per chip. SK Hynix says its HBM4E cuts power consumption by over 20% and improves heat resistance by 17% compared to HBM4, using its proprietary Advanced MR-MUF packaging technology for structural stability.
The race ultimately comes down to one customer: NVIDIA. NVIDIA's next-generation Rubin GPUs are expected to use HBM4E, and whoever clears NVIDIA's validation process first will secure a commanding position in this highly lucrative market. SK Hynix previously held a near-monopoly on NVIDIA's HBM3E supply after Samsung was plagued by yield issues. Samsung's three-week head start on sample delivery this time is a clear bid to claw back ground.
The market is expanding at an exponential rate. Industry analysts estimate the global HBM market will exceed $30 billion in 2026, roughly tripling from 2024. The first commercial products featuring HBM4E are expected to arrive in late 2026 or early 2027. Beyond the two Korean giants, Micron is also ramping up its efforts, solidifying a three-way battle for AI memory supremacy.
WangDou's Take
The competition between these two can be summed up in one phrase: relentlessly one-upping each other. Samsung ships samples three weeks early, SK Hynix fires back with 20% lower power draw and 17% better thermals — you're fast, I'm efficient, neither willing to concede. But the real scoreboard isn't who ships samples first — it's who clears Jensen Huang's validation gauntlet. NVIDIA's testing process is like a college entrance exam: acing the mock test means nothing if you bomb the real thing. Samsung got burned badly on HBM3E yield rates last year, and this time they're sprinting out of the gate just to prove they can do packaging, not just DRAM. At 48GB per chip and 16Gbps speeds, slap six of these on a single GPU and you've got 288GB of VRAM — this isn't "high bandwidth memory" anymore, it's a rocket engine strapped to an AI chip.
Source: CNBC — Samsung shares rally after shipping industry-first HBM4E AI memory chip samples · SK hynix — SK hynix Ships Samples of 12-Layer Next-Gen HBM4E