Introduction
As multi-die designs continue to scale across AI and high-performance computing (HPC), the demand for higher bandwidth, tighter integration, and predictable system-level performance has never been greater. Designs are integrating more dies (also called chiplets) within a single package, driving the need for faster, more robust die-to-die connectivity.
The Universal Chiplet Interconnect Express (UCIe) standard was created to address this challenge, providing a common interface for interoperable, high-speed communication between chiplets. As adoption grows, the focus is shifting beyond interoperability to performance, scalability, and silicon-proven reliability.
Moving Beyond 32G: Why 40G Matters
Historically, UCIe implementations have operated at lower per-lane data rates. But as AI workloads continue to scale, the amount of data moving between dies is increasing dramatically, often reaching tens of terabits per second. To meet this demand, higher per-lane data rates are essential. Advancing to 40G per lane enables designers to deliver more performance within similar area and power profiles.
This increase is not just about raw speed; it directly impacts system-level efficiency, allowing designers to scale performance without proportionally increasing complexity or cost.