Samsung Begins Mass Production of HBM4 Memory
Samsung has reportedly begun mass production of its next-generation HBM4 memory chips, a critical component for scaling AI data centers. The new memory is designed to boost data density and bandwidth to address AI's primary bottlenecks. This move intensifies competition with rivals like Micron, which has reportedly already committed its entire 2026 HBM4 supply.
- The official JEDEC standard for HBM4 (JESD270-4) doubles the memory interface width to 2048-bits, a fundamental architectural shift from the 1024-bit interface used in HBM3 and HBM3E. This wider bus allows for significantly higher bandwidth even at more power-efficient clock speeds. - Samsung's HBM4 achieves a data processing speed of 11.7 Gbps per pin, with total memory bandwidth reaching up to 3.3 TB/s in a single stack. The new design also improves power efficiency by 40% and heat dissipation by 30% compared to the previous HBM3E generation. - A key manufacturing innovation is the use of advanced logic processes, such as Samsung's 4nm node, for the base die that controls the memory stack. This allows for more sophisticated on-chip logic and is a critical factor in achieving higher performance and efficiency compared to the legacy processes used in prior HBM generations. - Demand for HBM4 is primarily driven by next-generation AI accelerators, most notably Nvidia's upcoming "Rubin" GPU platform, which is expected to utilize eight HBM4 stacks per chip. Nvidia reportedly pushed memory suppliers to increase per-pin speeds, influencing the final production specifications. - The competitive landscape is fierce, with SK Hynix and Micron also beginning HBM4 mass production in early 2026. SK Hynix is a major supplier for Nvidia, while Micron has reportedly pre-sold its entire HBM4 production capacity for the 2026 calendar year. - Even as HBM4 enters production, plans are already in place for HBM4E (an "extended" version) with samples expected in the second half of 2026. This next iteration aims to push data rates even higher, with some roadmaps targeting speeds of 12 GT/s and bandwidth approaching 3 TB/s per stack.
