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One Korean-language item from the same day that did not make the English wires: supply-chain tracking has SK hynix already in volume shipment of a 48GB 16-high HBM4 part for Vera Rubin during Q3, ahead of any company announcement. Samsung's line to Korean reporters is that 16-high demand is limited and commercialising one is unnecessary for now, while it finishes qualifying 12-high; Micron has sampled 16-high without announcing volume. Worth watching because Nvidia buys HBM by the stack and every stack costs one advanced-packaging slot — with CoWoS lead times at 52-78 weeks, stack height is the only lever that turns a fixed allocation into more revenue.

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