Baidu Kunlunxin P800 AI Accelerator Interconnect and Packaging Analysis

Reverse-engineering analysis of Baidu Kunlunxin P800 dives into the 2.5D packaging, interposer technology, substrate design, and more.

This report delivers an in‑depth reverse‑engineering analysis of Baidu’s Kunlunxin P800 AI accelerator, revealing a rare and strategically significant case of dual‑sourced 2.5D advanced packaging within a single HPC product. By comparing a Chinese‑manufactured monolithic silicon interposer package with a Samsung I‑CubeS4 counterpart, the report reveals critical differences in interposer technology, integrated passives, encapsulation strategies, and substrate design while demonstrating how both solutions achieve pin‑compatible system functionality. The report provides unique insight into China’s domestic packaging capabilities, the technical trade‑offs of second‑sourcing complex 2.5D assemblies, and broader implications for AI hardware supply chains under evolving export controls.