NVIDIA Mellanox MCX4412A-ACQN ConnectX-4 Lx EN, 25GbE Dual-Port OCP 2.0 Adapter: This is an Open Compute Project (OCP) Specification 2.0 Type 1 mezzanine network interface card based on the ConnectX-4 Lx Ethernet controller. It provides dual-port 25GbE connectivity over SFP28 cages with a PCIe Gen3 x8 host interface. This is a mezzanine OCP form factor — it is NOT a standard PCIe slot card and does NOT include a PCIe bracket. This is a brand-new, unused unit.
Engineering Context
The ConnectX-4 Lx silicon delivers up to 25Gb/s per port at line rate with low CPU overhead. The OCP 2.0 Type 1 mezzanine connector mounts the card flat against the motherboard, eliminating slot blockage and improving thermal flow in dense 1U/2U OCP-compliant servers. Hardware offloads include RDMA over Converged Ethernet (RoCE v1/v2), VXLAN/NVGRE/GENEVE tunnel offload, SR-IOV (up to 256 VFs), TCP/UDP/IP checksum, and Large Send/Receive Offload (LSO/LRO).
Deployment & Use Cases
OCP-based hyperscale racks running 25GbE leaf networks. Dual-port redundancy for storage targets in Ceph, vSAN, and NVMe-oF JBOFs. East-west traffic between virtualized workloads under KVM, VMware ESXi, and Hyper-V. Cloud tenant networks needing SR-IOV pass-through. Containerized environments using DPDK or RoCE for accelerated messaging.
Technical Specifications
- OEM: NVIDIA Mellanox
- Part Number: MCX4412A-ACQN
- Controller: ConnectX-4 Lx EN
- Form Factor: OCP Spec 2.0 Type 1 Mezzanine
- Ports: Dual-Port (2x SFP28)
- Data Rate: 25GbE / 10GbE / 1GbE per port
- Host Interface: PCIe Gen3 x8 (8 GT/s)
- Bracket: None (OCP mezzanine)
- Offloads: RoCE v1/v2, SR-IOV, VXLAN, NVGRE, GENEVE
- Compliance: RoHS R6
- Condition: New — Sealed by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Requires an OCP Specification 2.0 Type 1 compliant server motherboard with the corresponding mezzanine connector. Will NOT fit standard PCIe slots. Will NOT fit OCP 3.0 SFF bays. Compatible with Mellanox-certified 25G SFP28 DACs, AOCs, and SR/LR transceivers; passive copper reach is up to 5m. NVIDIA MLNX_OFED, MLNX_EN, or in-box Linux/Windows drivers required. Supports Ethernet only (not InfiniBand).
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS stocks new and refurbished NVIDIA Mellanox ConnectX-4 Lx OCP 2.0 mezzanine cards for hyperscale and OCP-spec deployments. Orders are processed within 1–3 business days with global shipping and full warranty coverage.