HBM3E

HBM Expansion Runs Up Against Stacking, Thermal, and DRAM Manufacturing Capacity Limits

An analysis presented during Hot Chips 2026 reveals that increasing HBM memory layers is no longer merely a matter of density and capacity, but has become a manufacturing-, packaging-, cooling-, and yield-level problem. Rising AI demand for HBM is also putting pressure on traditional DRAM supplies, at a time when new fabs require years before production begins.