HBM, Why So Expensive?

Discover why HBM is so expensive and scarce. This guide breaks down the real technical challenges in HBM design, manufacturing, testing, and packaging, from TSVs to CoWoS bottlenecks.

Right now, HBM (High Bandwidth Memory) has become one of the hottest topics in the industry. Stock forums, news outlets, and even dinner tables are all talking about it—“HBM supply shortage” or “NVIDIA’s GPU production is constrained because of HBM.”

Yet almost no one explains exactly why it is so difficult. Most reports stop at “they stack chips using TSV (Through-Silicon Vias)” or “the micro-bumps must be perfectly aligned.” That is not an explanation—it’s just a statement.

This article will walk through every stage of HBM production—design, manufacturing, testing, and packaging—and explain the real technical challenges at each step. It will also cover what happens after the product is delivered to customers, because that is where the truly surprising and fascinating parts begin. Everything in this article is based on first-hand experience and publicly available technical documentation.