SK Hynix reportedly starts Nvidia HBM4 shipments ahead of September ramp

SK Hynix’s early HBM4 volume delivery signals the AI memory race has shifted from specs to execution. Technically, this pressures TSMC to accelerate CoWoS capacity for higher-stack integration and forces EDA and thermal solutions to evolve in lockstep. On compliance, pending U.S.-ROK export controls on HBM4 to China could impose redundant fab costs during yield ramp-up. With Samsung still qualifying HBM4, SK Hynix is locking in NVIDIA as its anchor client for next-gen GPUs, pushing Micron toward AMD or Taiwan, China clients as a hedge. Within 18 months, HBM4 adoption will redefine AI chip economics—memory may exceed 50% of BOM—and catalyze new heterogeneous integration standards, excluding laggards from the high-end training ecosystem.