Network adapter card MELLANOX CONNECTX-6 LX EN 25GbE OCP3.0 dual-port SFP28 PCIe 4.0 x8 with host management (MCX631432AN-ADAB)

The MELLANOX CONNECTX-6 LX EN 25GbE OCP3.0 dual-port SFP28 PCIe 4.0 x8 network adapter provides 25 Gigabit Ethernet connectivity in an OCP3.0 low-profile form factor. Equipped with two SFP28 ports and a PCI Express 4.0 x8 host interface, this card is built for server and data center environments that require reliable, high-throughput links. Integrated host management support enables remote monitoring and configuration to simplify deployment and operational tasks.

Advantages

This adapter delivers high bandwidth and low latency suitable for modern virtualization and storage networks. The OCP3.0 form factor and low-profile bracket with a thumb screw pull tab allow flexible mounting in compatible server designs. Dual SFP28 ports support a range of optical or DAC transceiver options for short- and long-reach links. PCIe 4.0 x8 interface ensures sufficient host bandwidth for multi-stream traffic and reduces bottlenecks in applications with heavy I/O. Built-in host management capabilities provide visibility into link status and allow remote configuration and firmware updates.

Suitable for

• Server network upgrades in data centers and colocation facilities
• Virtualized environments and hyperconverged infrastructure
• Block and file storage networks (e.g., NVMe-oF, iSCSI)
• High-performance computing clusters and distributed applications
• Network function virtualization and edge compute nodes

Key specifications

• Interface: PCI Express 4.0 x8 host interface
• Network speed: 25 Gigabit Ethernet per port
• Ports: Dual SFP28 ports supporting optical or DAC transceivers
• Form factor: OCP3.0 low-profile adapter
• Management: Integrated host management for remote monitoring and configuration
• Latency: Low-latency architecture suitable for high-throughput workloads
• Use case orientation: Designed for server and data center deployments

How to use

Install the adapter into a compatible PCIe 4.0 x8 or higher slot on the server motherboard following the server vendor’s hardware installation procedures. Secure the OCP3.0 bracket in the server chassis using the provided thumb screw pull tab if applicable. Insert compatible SFP28 transceivers or DAC cables into the SFP28 ports, then connect to the network switch or transceiver endpoints. Power on the server and verify that the host recognizes the adapter. Use the operating system’s network configuration tools and the adapter’s host management interface to assign IP settings, configure link speeds and features, and apply any recommended firmware updates.

Usage recommendations

For optimal performance, pair the adapter with SFP28 transceivers certified for 25GbE and ensure the server BIOS and OS drivers are updated to versions recommended by the server and adapter vendors. Use quality DACs or fiber cabling and ensure switch ports are configured for matching speeds and flow control settings to maintain low latency and stable throughput.