DRAM-Scaling-1974 Step 17 Weigh Industrial Strategy Trench Versus Stacked Alliances

# Weigh the Industrial Strategy Behind Each Side of the Fork

Step 11 named which real companies chose which geometry; this step asks why, treating the choice as a strategic bet rather than a purely technical one.

## 1. State the Strategic Dimension Step 9's Technical Comparison Did Not Need

Step 9 compared trench and stacked capacitors on capacitance recovered per unit of process complexity added — a fair technical comparison, but one that implicitly assumes a manufacturer could adopt either path at equal cost. In practice, a manufacturer's existing equipment base, process expertise, and prior capital investment (Step 13's deep-RIE tooling for trench adopters; polysilicon deposition and patterning strength for stacked adopters) made one path cheaper than the other for that specific manufacturer, regardless of which path was technically superior in the abstract.

Weigh the Industrial Strategy Behind Each Side of the Fork Step 17 — dram-scaling-1974 State the Strategic Dimension Step 9's Technical see Section 1 Trace the Consequence of Betting on the Wrong Si see Section 2 State What This Adds Without Overclaiming It see Section 3 THREE-PART ARGUMENT, ONE STEP dram-scaling-1974 extension, step 17 of this project's DRAM lineage

## 2. Trace the Consequence of Betting on the Wrong Side Early

A manufacturer that invested heavily in deep-RIE trench capability and later needed to pivot toward stacked-capacitor manufacturing (as the industry's broader convergence toward stacked capacitors through the 1990s, gestured at in Step 10's retrospective, eventually favored) faced a real capital-reallocation cost beyond the pure device-physics tradeoff this series measured in Step 9. This is the same kind of strategic-commitment risk this project's Mesa Production (1958) series treats for a different generation's manufacturers committing to mesa-geometry production before the planar process made that commitment obsolete.

Step 17 in the Dram-Scaling-1974 Lineage what this step inherits and what it hands forward, by name Step 17 this step Inherits prior steps Hands Off named thread NO CELL-PHYSICS OR ARCHITECTURE RE-ARGUED each step adds a distinct angle; none re-derive settled prior content

## 3. State What This Adds Without Overclaiming It

This step does not claim industrial strategy determined the fork's outcome more than device physics did — both mattered, and this series' earlier steps (technical) and this step (strategic) describe two genuinely separate dimensions of the same historical decision, each real, neither sufficient alone to explain why the industry ultimately converged where it did.

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