NVIDIA Mellanox MCX341A-XCEN ConnectX-3 EN OCP Mezzanine Card, Single-Port SFP+ 10GbE — Lot of 4: This listing is for four (4) ConnectX-3 EN single-port SFP+ network adapters in the OCP 2.0 mezzanine form factor. The card slots into an OCP-compliant motherboard mezzanine connector, not a standard PCIe edge slot. This is an Ethernet-only (EN suffix) variant with one SFP+ cage. These are refurbished units, tested in working order.
Engineering Context
The MCX341A-XCEN is built on Mellanox ConnectX-3 EN silicon and uses an OCP Mezzanine 2.0 connector that carries a PCIe 3.0 x8 8 GT/s host link to the server motherboard. The unit has no PCIe bracket — it is a daughtercard, not a PCIe add-in. The card supports stateless TCP/UDP offloads, RoCE v1/v2, SR-IOV, and IPMI/UEFI IPv6 management pass-through. As an Ethernet-only ConnectX-3 EN, it does not run InfiniBand and cannot be flipped to IB mode.
Deployment & Use Cases
10GbE network connectivity for OCP-spec servers (OpenRack, Tioga Pass-class boards, Yosemite/Twin-Lakes sleds). Top-of-rack uplinks for hyperscale and white-box deployments. RoCE-capable storage front-ends running NVMe-oF over RoCE in OCP chassis. Replacement units for existing OCP server fleets that already use Mellanox NICs.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX341A-XCEN
Quantity: Lot of 4 cards
ASIC: ConnectX-3 EN (Ethernet only)
Ports: 1 x SFP+
Speed: 10GbE (also 1GbE)
Host Bus: PCIe 3.0 x8 (8 GT/s)
Form Factor: OCP Mezzanine 2.0 (Type 1)
Offloads: RDMA / RoCE v1+v2, SR-IOV, stateless TCP/UDP
Management: IPMI and UEFI IPv6 pass-through
Bracket: No PCIe bracket (mezzanine)
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Requires an OCP Mezzanine 2.0 connector on the host motherboard with PCIe 3.0 x8 routing — it will not fit into a standard PCIe slot or the Open Compute NIC 3.0 socket. As an EN-class card it is Ethernet-only and will not enumerate as InfiniBand. The single SFP+ cage caps the card at 10 Gb/s; it is not a 25GbE card. Do not pair with QSFP+ cabling without the appropriate QSFP-to-4xSFP+ breakout topology, and even then this card terminates only one SFP+ lane.
Why Choose T.E.S IT-SOLUTIONS
Each card in this lot is bench-tested by T.E.S IT-SOLUTIONS for 10GbE link-up, PCIe link training, and mezzanine connector integrity. We provide expert consultation on OCP server deployments, global shipping, and 1–3 day handling time.
Frequently Asked Questions
What host bus does the MCX341A-XCEN have?
The MCX341A-XCEN host bus is PCIe 3.0 x8 (8 GT/s), as listed in the specifications for MCX341A-XCEN.
What is the MCX341A-XCEN NOT compatible with?
The card slots into an OCP-compliant motherboard mezzanine connector, not a standard PCIe edge slot. Confirm fitment against your platform before ordering MCX341A-XCEN.
What condition is the MCX341A-XCEN supplied in, and who sells it?
The MCX341A-XCEN is supplied in Refurbished condition by T.E.S IT-SOLUTIONS from EU stock, with 1-3 business day handling and worldwide B2B shipping. See https://www.tes-itsolutions.com/product-page/lot-of-4-mellanox-mcx341a-xcen-connectx-3-network-interface-card-for-ocp-10gb-s.