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Welcome to the OCP Mezzanine NIC subgroup under OCP Server Work Group. The goal of this subgroup is to form a healthy ecosystem in Mezzanine NIC space, under OCP framework.


We are here to build a supportive, informative and inclusive community:


- Support implementation questions

- Evaluate new use cases


- Share the latest topics and trends related to OCP Mezz NIC spec

- Share both challenges and opportunities


- Take community feedback and make iterations to proposal before submitting major revision to work group and IC

- Open to both adopters, and observers

Get Involved



1. Video of 3/17/2017 OCP Server workshop talk - Mezz 2.0 and beyond

2. Slide deck of 3/9/2017 workshop

3. Visco file for placement study

Find Archive of updates here

Find archive of mailing-list here



OCP Engineering Workshop Sessions

More information about OCP events can be found at:


This project meets - Monthly Source of truth@ (Time zone shown: Eastern Time) This call is open to the public.

1st meeting is tentatively hold @ 2017/3/1 9AM-PST / 12PM-EST / 1AM-Taipei/Beijing(+1day)

The agenda as well as information on how to join the call can be found at: TBD

Meeting minutes are available at: TBD


- Project communication is done through the opencompute-mezz-card mailing list.

- To get on the mailing list or manage your subscription go to:

- Please make sure following the steps until you receive confirmation email and welcome email from

Please check your junk box and unblock if you have trouble getting confirmation email.

- To access the mailing list archives go to:

Specifications and Designs

All these accepted by the IC

Specification Version Submit Date Contributor License Notes
OCP Mezzanine card v2.0

OCP_Mezz_2.0_rev1.00_20151215b_pub_release.pdf(2.2MB) (88MB)

Mechanical 20151023_P1-P9_K1-K5 zip file (57MB)

V2.0-1.0 Dec 15, 2015 Facebook OWFa 1.0 Added support for x16 (quad x4), NCSI, dual QSFP+, & Quad SDP+

Accepted by OCP IC 2/24/2016

OCP Mezzanine card v0.5, original standard

Mezzanine Card (rev 0.5)

V0.5 Oct 8, 2012 Facebook OWFa 1.0 Defacto standard for the original network mezzanine with a x8 PCIe Gen3 interface