Toward Open-Source Chiplets for HPC and AI: Occamy and Beyond

Paul Scheffler; Thomas Benz; Tim Fischer; Lorenzo Leone; Sina Arjmandpour; Luca Benini

Toward Open-Source Chiplets for HPC and AI: Occamy and Beyond

Hardware Architecture 2025-11-20 v1

Authors: Paul Scheffler , Thomas Benz , Tim Fischer , Lorenzo Leone , Sina Arjmandpour , Luca Benini

Abstract

We present a roadmap for open-source chiplet-based RISC-V systems targeting high-performance computing and artificial intelligence, aiming to close the performance gap to proprietary designs. Starting with Occamy, the first open, silicon-proven dual-chiplet RISC-V manycore in 12nm FinFET, we scale to Ramora, a mesh-NoC-based dual-chiplet system, and to Ogopogo, a 7nm quad-chiplet concept architecture achieving state-of-the-art compute density. Finally, we explore possible avenues to extend openness beyond logic-core RTL into simulation, EDA, PDKs, and off-die PHYs.

Keywords

computer architecture

Cite

@article{arxiv.2511.15564,
  title  = {Toward Open-Source Chiplets for HPC and AI: Occamy and Beyond},
  author = {Paul Scheffler and Thomas Benz and Tim Fischer and Lorenzo Leone and Sina Arjmandpour and Luca Benini},
  journal= {arXiv preprint arXiv:2511.15564},
  year   = {2025}
}

Comments

8 pages, 8 figures, 1 table, submitted to 2026 IEEE CICC for possible publication

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