Analyze Yield Economics at 4k Density

# Analyze Yield Economics at 4K Density

Quadrupling the number of memory cells on a comparable die made the 4K generation more sensitive to any single defect, since a flaw in one cell could spoil an entire larger array.

Fabs running the 4K generation had to tighten defect density control relative to the 1K generation just to hold working-die yield at an economically viable level.

Despite that added difficulty, the economics still favored the denser part, because a working 4K chip delivered four times the bits per package, spreading fixed packaging and testing costs across far more usable memory.

YIELD PRESSURE AT 4KArray sizefour times the cells of the 1K generationDefect sensitivityone flaw can spoil a larger arrayFab responsetighter defect-density control needed to hold yield

Diagram above: yield pressure at 4k.

WHY THE ECONOMICS STILL WORKEDBits per package4x the bits for roughly the same packaging costCost per bitfalls even if per-die yield drops somewhatNet result4K parts beat 1K parts on cost per bit despite tighter yield demands

Diagram above: why the economics still worked.

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