Identity & Definition
The NVIDIA Mellanox MCX342A-XCGN is a 10GbE enterprise Ethernet network interface card (NIC) in OCP (Open Compute Project) mezzanine form factor, sold in new condition. This dual-port SFP+ adapter is based on Mellanox ConnectX-3 EN technology and connects via PCIe 3.0 x8. The MCX342A-XCGN is an Ethernet-only OCP adapter — it is NOT a standard PCIe add-in card (no bracket), NOT a VPI card, and NOT a ConnectX-3 Pro variant. It includes IPMI and NC-SI management support and is RoHS R6 certified.
Engineering Context
The MCX342A-XCGN delivers 10Gb/s per port (20Gb/s aggregate) over its two SFP+ ports via a PCIe 3.0 x8 interface in an OCP mezzanine slot. ConnectX-3 EN technology supports SR-IOV for NIC virtualization, stateless TCP/UDP/IP offload, and RoCE v1. The integrated IPMI and NC-SI sideband management interface enables out-of-band NIC management through the server BMC, a key requirement in OCP and hyperscale server designs.
Deployment & Use Cases
The MCX342A-XCGN is deployed in OCP-compliant server platforms requiring 10GbE connectivity with out-of-band management. Typical use cases include hyperscale data centers with OCP server designs, VMware ESXi and KVM virtualization hosts using SR-IOV, iSCSI and NFS storage network connections, and 10GbE access-layer fabric links where BMC-level NIC management via NC-SI is required.
Technical Specifications

Part Number (MPN): MCX342A-XCGN
Adapter Family: ConnectX-3 EN
Adapter Type: Ethernet NIC (OCP Mezzanine)
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)
Management: IPMI, NC-SI
Condition: New

Compatibility & Hard Constraints
The MCX342A-XCGN requires an OCP-compliant mezzanine slot. It is NOT compatible with standard PCIe expansion slots — 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. It is NOT the ConnectX-3 Pro variant — for Pro features (hardware timestamping, RoCE v2), consider the MCX342A-XCQN instead.
Why Choose T.E.S IT-SOLUTIONS
Every MCX342A-XCGN adapter sold by T.E.S IT-SOLUTIONS is factory-sealed and new. Our team provides technical consultation on NVIDIA Mellanox OCP adapter compatibility, NC-SI management setup, and deployment planning. Orders ship within 1–3 business days with worldwide delivery and protective packaging.