Extreme Ultraviolet Lithography EUV

What is IBM’s nanostack chip architecture?

IBM announced a new sub-1 nanometer nanostack chip architecture that stacks transistors vertically instead of horizontally, promising nearly double the transistor density of current 2nm chips. Cody leads skeptically: the announcement is a capability claim without shipping proof, and the fabrication challenges—wafer-to-wafer bonding precision, High NA EUV maturity, and unknown yield at volume—are enormous. Justy pushes back: the material-decoupling unlock (optimizing n-type and p-type transistors independently) is real, and for AI accelerators, the power efficiency gains directly address data-center bottlenecks. They land on a shared reading: IBM's architecture is mechanistically sound and the roadmap credible, but this is a research milestone, not a product—and the gap between lab demo and foundry-scale manufacturing is where most announcements die.