A Statement from the OpenCAPI Consortium Leadership

As announced on August 1, 2022 at the Flash Memory Summit, the OpenCAPITM Consortium (OCC) and Compute Express LinkTM (CXL) Consortium entered an agreement, which if approved and agreed upon by all parties, would transfer the OpenCAPI and Open Memory Interface (OMI) specifications and other OCC assets to the CXL Consortium.

The members of both consortiums agreed that the transfer would take place September 15, 2022. Upon completion of the asset transfer, OCC will finalize operations and dissolve.  OCC member companies in good standing will be contacted with details of their specific membership benefits in CXL.

The OCC leadership extends its gratitude to its members and supporters for six years of effort producing the specifications for a cache-coherent interconnect for processors, memory expansion, accelerators and for a serial attached near memory interface providing for low latency and high bandwidth connections to main memory (OMI).

We are excited to witness the industry coming together around one organization to drive open innovation.  We expect this will yield the finest business results for the industry and for the members of the consortia.

Bob Szabo, OpenCAPI Consortium President

About the CXL™ Consortium

The CXL Consortium is an industry standards body dedicated to advancing Compute Express Link™

(CXL™) technology. CXL is a high-speed interconnect offering coherency and memory semantics using

high-bandwidth, low-latency connectivity between the host processor and devices such as accelerators,

memory buffers, and smart I/O devices. For more information or to join, visit www.computeexpresslink.org.



OpenCAPI Workshop – Transitioning Local Memory from DDR to the OMI Interface

Flash Memory Summit 2022 – August 1, 2022

Thank you for visiting the OpenCAPI Consortium Booth #651 at FMS 2022!

The Future of Low-Latency Memory – Why Near Memory Requires a New Interface

Read what the Analysts have to say:  OMI (Open Memory Interface) Excels in Analysts’ White Paper

Forbes:  Near Memory Options And Possible HDD/SSD Demand For Cryptocurrency

Webinar:  Latest Trends in Memory Disaggregation

In case you  missed this informative event, or you would like to review for reference or further listening, please click on the following links:

YouTube Presentation

Slide Presentation


March 25, 2021 – 12:00 – 2:00 pm Eastern Time/9:00 – 11:00 am Pacific Time/4:00 – 6:00 pm GMT

In this webinar, you heard about the latest on memory disaggregation research trends and applications from researchers in industry and academia.  The concept of memory disaggregation has been around for a while now. However, it only recently took-off generating wide interest.  A combination between more integrated support in CPUs (e.g., OpenCAPI coherent attachment and IBM’s POWER10 with Memory Inception) and new applications requiring unprecedented amounts of memory have made this technology an appealing solution. Applications of memory disaggregation are spanning from big-data and in memory-databases, to a tool for optimizing utilization and minimizing costs in a data-center.

Check out these downloadable specifications for public learning purposes! 

OpenCAPI 3.0 Transaction Layer Specification  

OpenCAPI 3.1 Transaction Layer Specification  

OpenCAPI 4.0 Transaction Layer Specification

OpenCAPI Data Link Layer Specification

OpenCAPI 32Gbps PHY Signaling Specification

OpenCAPI 32Gbps PHY Mechanical Specification

OpenCAPI 25 Gbps PHY Mechanical Specification

OpenCAPI 25 Gbps PHY Signaling Specification

OpenCAPI Discovery and Configuration Architecture Specification


Fill out the form “Download the Standard” at the bottom of this page to download the specifications.

Attention Members Only –  See all approved specifications. 

Please click on the member login and view the All Members documents.

How to become OpenCAPI Ready

The OpenCAPI Ready™ program is used by the OpenCAPI Consortium to enable OpenCAPI ecosystem product developers to indicate that a product has been shown/demonstrated to meet a minimum set of characteristics and should be interoperable with other OpenCAPI Ready products.

Click here to submit your product:  OpenCAPI Ready Submission

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