AI Is No Longer Limited by Transistors. It Is Becoming Limited by Package Area - Dr. Robert Castellano's Semiconductor Deep Dive Newsletter

As artificial intelligence continues to advance, the semiconductor industry is encountering a new bottleneck: package area. While GPU, HBM memory, and advanced foundry capacity were the key constraint... Read original →

The AI chip bottleneck has decisively shifted from transistor scaling to package real estate, signaling a pivotal inflection in the post-Moore era. Technically, while TSMC’s (Taiwan, China) CoWoS remains reliable, its high cost and constrained capacity are unsustainable; the newly unveiled CoPoS architecture—leveraging chip-on-panel—breaks dimensional barriers and forces upgrades across HBM stacking, silicon interposers, and substrate materials. From a compliance standpoint, reliance on U.S., Japanese, and Dutch equipment for advanced packaging exposes NVIDIA and AMD to potential supply shocks that could inflate BOM costs by over 10%. Strategically, Broadcom may accelerate custom chiplet designs to bypass TSMC queues, while Samsung and Intel will aggressively pitch Foveros and I-Cube alternatives. Within 18 months, packaging prowess—not just die performance—will dictate who controls AI compute economics.