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01 ·Fabrication & Packaging·★ MEMBER·10 min read Advanced Packaging — How CoWoS and HBM Stacking Became the Bottleneck for AI What limited the supply of AI accelerators was not leading-edge logic wafers but the step that puts several finished chips into one part. From the reticle limit and the exponential math of yield, through 2.5D interposers, HBM stacks and TSVs, to hybrid bonding and the bill that heat and warpage send back.