Identity & Definition
The NVIDIA Mellanox MCX342A-XCCN is a 10GbE enterprise Ethernet network interface card (NIC) in OCP (Open Compute Project) mezzanine form factor, sold in refurbished condition. This dual-port SFP+ adapter is based on Mellanox ConnectX-3 EN technology and connects via PCIe 3.0 x8. The MCX342A-XCCN is an Ethernet-only OCP adapter — it is NOT a standard PCIe add-in card (no bracket), NOT a VPI (InfiniBand + Ethernet) card, and NOT a QSFP form factor device.
Engineering Context
The MCX342A-XCCN delivers 10Gb/s per port (20Gb/s aggregate) over its two SFP+ ports. The adapter connects to the host via a PCIe 3.0 x8 interface in an OCP mezzanine slot. ConnectX-3 EN technology supports hardware offloads including SR-IOV for NIC virtualization, stateless TCP/UDP/IP offload, and RoCE (RDMA over Converged Ethernet) v1. The OCP form factor enables tool-less installation in OCP-compliant server chassis without standard PCIe brackets.
Deployment & Use Cases
The MCX342A-XCCN is deployed in OCP-compliant server platforms requiring 10GbE connectivity. Typical use cases include hyperscale data centers with OCP server designs, VMware ESXi and KVM virtualization hosts using SR-IOV passthrough, iSCSI and NFS storage network connections, and 10GbE access-layer fabric links. The dual-port design supports network redundancy, link aggregation (LACP), or dual-network segmentation (management + data).
Technical Specifications

Part Number (MPN): MCX342A-XCCN
Adapter Family: ConnectX-3 EN
Adapter Type: Ethernet Network Interface Card (NIC)
Port Count: 2 (Dual-Port)
Port Type: SFP+
Data Rate: 10Gb/s per port (20Gb/s aggregate)
Host Interface: PCIe 3.0 x8
Form Factor: OCP Mezzanine (No Bracket)
Protocols: 10GbE, 1GbE, RoCE v1, SR-IOV
Condition: Refurbished

Compatibility & Hard Constraints
The MCX342A-XCCN requires an OCP-compliant mezzanine slot. It is NOT compatible with standard PCIe expansion slots in conventional rack-mount servers — it has no bracket and uses the OCP mezzanine connector. The SFP+ ports accept 10GbE SFP+ transceivers, 10GbE SFP+ DAC cables, or 1GbE SFP optics for downshift operation. It is NOT compatible with SFP28 25GbE optics at 25GbE speeds. For standard PCIe form factor, consider the MCX342A-XCAN (with bracket).
Why Choose T.E.S IT-SOLUTIONS
Every MCX342A-XCCN adapter sold by T.E.S IT-SOLUTIONS is functionally tested and verified before shipment. Our team provides technical consultation on NVIDIA Mellanox OCP adapter compatibility, SFP+ transceiver selection, and deployment planning. Orders ship within 1–3 business days with worldwide delivery and protective packaging.