TechWhat Is HBM? The Stacked DRAM Architecture That Made Memory—Not Compute—the Deciding Factor in AI Performance
A ground-up explainer on HBM (High Bandwidth Memory), the technology shaping AI semiconductor performance. Covers the mechanics of stacking DRAM and connecting it via TSVs, the differences from GDDR, the three-way competition and base die logic shift in the HBM4 generation, the market's rapid expansion toward roughly $60 billion, the resulting DRAM price surge, and the business opportunities for Japanese companies.
15 min read