NVIDIA Mellanox MCX441A-ACAN ConnectX-4 EN 25GbE Network Interface Card: This is a single-port 25 Gigabit Ethernet adapter in OCP Mezzanine 2.0 Type 1 form factor with an SFP28 cage. The card is engineered for high-bandwidth server-to-fabric connectivity in scale-out cloud and storage deployments. This is an OCP mezzanine card, not a standard PCIe slot adapter, and requires an OCP-compliant host chassis. This is a refurbished unit.
Engineering Context
The MCX441A-ACAN integrates the ConnectX-4 ASIC with Mellanox’s RDMA over Converged Ethernet (RoCE) v1/v2 stack and stateless TCP/UDP/IP offloads. The single-port design pairs a PCIe Gen3 x8 host interface with line-rate 25GbE forwarding. SR-IOV is supported for multi-tenant virtualization. The OCP mezzanine form factor frees standard PCIe slots in dense rack designs, enabling consolidated cabling at the chassis bulkhead. The card supports message-rate offload at over 75 million packets per second per port.
Deployment & Use Cases
OCP-compliant server platforms (such as Open Compute Project hyperscale designs) requiring NIC consolidation. 25GbE storage fabric uplinks for Ceph, Lustre, NFS over RDMA, and SMB Direct workloads. Hyperconverged infrastructure (HCI) nodes running VMware vSAN, Nutanix, or Microsoft Storage Spaces Direct. Cloud-tenant compute hosts where SR-IOV-based NIC virtualization is required.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCX441A-ACAN
Product Family: ConnectX-4 EN
Form Factor: OCP Mezzanine 2.0 Type 1
Host Interface: PCIe 3.0 x8
Data Rate: 25GbE
Ports: 1 (Single-Port)
Connector: SFP28
Protocol: 25GbE Ethernet
RDMA: RoCE v1 and v2
Virtualization: SR-IOV
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Designed for OCP Mezzanine 2.0 Type 1 server slots — not a standard PCIe slot adapter and cannot be installed in conventional servers without an OCP-compatible chassis. Compatible with standards-based 25GbE switches that have SFP28 ports. SFP28 cages also accept SFP+ 10GbE optics and DACs for fallback compatibility, but do not accept QSFP28 100GbE modules. This is the EN (Ethernet-only) variant; it does not operate in InfiniBand mode. Driver support: Mellanox OFED, Linux inbox mlx5_core, and Windows WinOF-2.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS (https://www.tes-itsolutions.com) tests every NIC for link establishment, RDMA functionality, and SR-IOV provisioning before shipment. Standard 1–3 day handling time. Expert consultation on OCP-compatible host platforms, global shipping, and comprehensive warranty.