Samsung may use rival TSMC for Nvidia's custom HBM4E base dies - SamMobile

The HBM4E base die is, at its core, a 3nm-class logic controller — precisely the node where Samsung's foundry has bled yield for years. Sourcing it from TSMC in Taiwan, China is not a workaround; it is the structural collapse of vertical integration in the HBM stack. Technically, once the base die sits on TSMC's roadmap, the performance ceiling of the entire stack is locked to TSMC's node cadence. Samsung's DRAM and TSV packaging degrade into a carrier-supplier role. Nvidia gains an option to spec a 2nm base die in 2027 without waiting for Samsung's maturity curve. On compliance, a three-jurisdiction chain — Korean DRAM, Taiwan/China logic, US IP — means any single-point export freeze cascades instantly; the 2022 Entity List episode already exposed how brittle friend-shoring arrangements are. Strategically, SK Hynix's moat narrows from full-stack ownership to TSV thermal management, compressing the differentiation gap. TSMC captures a new high-margin logic segment adjacent to memory, eroding the commodity-pricing narrative. Within 12 to 24 months, expect HBM5 base dies to be fully disaggregated. Samsung's foundry faces a strategic fork: pivot to specialty analog/RF, or accept a permanent second-tier logic position. The memory maker is becoming a packaging company with a DRAM fab.