NVIDIA Mellanox MCX4411A-ACAN ConnectX-4 Lx EN 25GbE Network Adapter, Single-Port SFP28, OCP 2.0 Mezzanine: This is a single-port 25GbE OCP 2.0 mezzanine network adapter built on the Mellanox ConnectX-4 Lx EN ASIC. It is designed for OCP-compliant servers that present an OCP 2.0 mezzanine slot rather than a standard PCIe expansion slot. This is a mezzanine form-factor card and does not include a PCIe bracket; it is not a low-profile or full-height PCIe NIC. This is a refurbished unit.
Engineering Context
The MCX4411A-ACAN attaches via PCIe Gen 3.0 x8 to the host CPU and exposes one SFP28 cage that supports 25GbE, 10GbE, and 1GbE rate negotiation. It runs the ConnectX-4 Lx EN feature set, including RDMA over Converged Ethernet (RoCEv1 and RoCEv2), stateless TCP/UDP/IP offloads, hardware checksum, VXLAN and NVGRE encapsulation offload, and SR-IOV virtualization for VM and container workloads. Power and signaling come from the OCP 2.0 mezzanine connector; a separate PCIe expansion slot is not used.
Deployment & Use Cases
OCP-form-factor compute servers (Open Compute Project nodes) that require 25GbE host connectivity in a low-profile mezzanine slot. Hyperscale and cloud-service-provider fleets where the OCP NIC is procured separately from the chassis. Storage front-end where RoCEv2 terminates NVMe-oF or Ceph traffic. Software-defined networking deployments that rely on SR-IOV for VM and container connectivity at 25GbE.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX4411A-ACAN
ASIC: ConnectX-4 Lx EN
Form Factor: OCP 2.0 Mezzanine (no PCIe bracket)
Ports: 1 x SFP28
Port Rate: 25 / 10 / 1 GbE
Host Interface: PCIe Gen 3.0 x8
RDMA: RoCEv1, RoCEv2
Virtualization: SR-IOV
Offloads: Stateless TCP/UDP/IP, VXLAN, NVGRE
Operating Systems: Linux (MLNX_OFED), Windows (WinOF-2), VMware ESXi
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible only with chassis that present an OCP 2.0 mezzanine slot using the Open Compute mezzanine connector — typically Open Compute Project servers from Wiwynn, Quanta, ZT Systems, and similar OCP-aligned OEMs. Not compatible with standard PCIe x8 expansion slots without a vendor-specific OCP 2.0 carrier; a regular ATX, EATX, or SFF server PCIe slot will not accept this card. It is a 25GbE NIC — speeds above 25Gb/s (40, 50, or 100GbE) are not supported. Driver support requires NVIDIA MLNX_OFED for Linux or NVIDIA WinOF-2 for Windows. Single SFP28 port; not a dual-port card. RoCEv2 requires a Data Center Bridging-capable switch fabric for lossless behavior.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every refurbished ConnectX-4 Lx OCP card for link bring-up, port operability, and firmware reachability before shipment. Visit tes-itsolutions.com for global shipping, expert consultation on OCP server NIC selection, and 1–3 day handling on in-stock inventory.