Welcome to OpenCAPI Consortium

The OpenCAPI Consortium is an open forum to manage the OpenCAPI specification and ecosystem. OpenCAPI is a not-for-profit organization formed in October 2016 by OpenCAPI Strategic Members AMD, Google, IBM, Mellanox Technologies and Micron to create an open coherent high performance bus interface based on a new bus standard called Open Coherent Accelerator Processor Interface (OpenCAPI) and grow the ecosystem that utilizes this interface. This initiative is being driven by the emerging accelerated computing and advanced memory/storage solutions that have introduced significant system bottlenecks in today’s current open bus protocols and requires a technical solution that is openly available.

Attention Members Only –  four new specifications approved.  Please click on the member login to view.

                          • OpenCAPI 25Gbps PHY Signaling Specification version 1.0
                          • OpenCAPI 3.0 Transaction Layer Specification Version 1.0
                          • OpenCAPI 3.1 Transaction Layer Specification Version 1.0
                          • OpenCAPI Ready Definition Specification Version 1.0



OpenCAPI showcases this year’s progress at SC19 and…

OpenCAPI held its first SNAP (Storage, Network, Analytics and Programming) Hands-on Workshop.  The workshop was an end-to-end educational session where the basic OpenCAPI technology and SNAP demo were presented.  The workshop enabled access to SNAP in a cloud environment so the attendees could give it a spin!


Join OpenCAPI

To join OpenCAPI, please download and review the 
OpenCAPI Consortium Membership Kit.

Once we receive your signed Membership Agreement, we will immediately begin on-boarding you into the OpenCAPI activities and adding you to our public membership roster.  If you have any membership questions, please contact us at membership@opencapi.org

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OpenCAPI In Action



Download The Standard

The new standard, called OpenCAPI provides an open, high-speed pathway for different types of technology – advanced memory, accelerators, networking and storage – to more tightly integrate their functions within servers. This data-centric approach to server design, which puts the compute power closer to the data, removes inefficiencies in traditional system architectures to help eliminate system bottlenecks and significantly improve server performance.

These specifications were contributed to the OpenCAPI Consortium pursuant of the IPR Policy as input specifications and will be reviewed and updated appropriately following the work group process.  

The OpenCAPI consortium looks forward to publishing draft specifications when this process completes.

OpenCAPI 3.0 Transaction Layer Specification (updated*)

OpenCAPI 3.1 Transaction Layer Specification (updated*)

*The changes in the V3.0 specification can be found in the revision log.  A new section on profiles has been added with some new terms and clarifications.  The V3.1 specification is a revision of the V3.0 specification (includes all the V3.0 changes) and adds new content.  The revision log shows the changes.  In both specifications, changes from the October drop have change bars noted.

OpenCAPI 3.0 Data Link Layer Specification

OpenCAPI 4.0 Transaction Layer Specification


Fill out the form to download the specifications

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