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).
Frequently Asked Questions (FAQ)
Q. What is the MCX4412A-ACQN?
The MCX4412A-ACQN is a ConnectX-4 Lx EN OCP 2.0 dual-port adapter at 25GbE Ethernet.
Q. Will it fit an OCP 3.0 slot?
No. This is an OCP 2.0 mezzanine card and requires an OCP 2.0 slot.
Q. Will T.E.S IT-SOLUTIONS confirm the configuration of MCX4412A-ACQN before shipping?
Yes. T.E.S IT-SOLUTIONS (tes-itsolutions.com) bench-tests each unit where test topology is available, before dispatch from EU stock.
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.