SK Hynix ships HBM4E samples to customers

SK Hynix’s timely shipment of HBM4E samples shifts the AI memory race from specs to yield stability. Technically, its 12-layer stack pressures TSMC to expand CoWoS capacity and forces EDA vendors to accelerate thermo-electrical co-simulation support. Although U.S. export controls haven’t yet targeted HBM4E, bandwidth exceeding 2TB/s could trigger BIS reclassification, raising customer compliance costs. With Samsung yet to tape out HBM4 and Micron stuck on 8-layer yields, SK Hynix is locking in NVIDIA and AMD for next-gen GPUs. Over the next 18 months, the HBM ecosystem will trend toward a ‘winner-takes-most’ dynamic: the first vendor achieving >95% TSV yield will likely set the de facto memory interface standard for AI accelerators, marginalizing laggards from the high-end supply chain.