NVIDIA Mellanox ConnectX-4 Lx EN 25G Dual-Port SFP28 PCIe 3.0 x8 Network Interface Card

The NVIDIA Mellanox ConnectX-4 Lx EN 25G is a high-performance dual-port SFP28 network interface card designed for cloud, HPC, and enterprise data centers. Leveraging the Mellanox ConnectX-4 Lx EN chipset, it delivers 25 Gigabit Ethernet connectivity with low latency and advanced offload capabilities, including RDMA over Converged Ethernet (RoCE), VXLAN, NVGRE, and Geneve. The card supports PCI Express 3.0 x8 interface and features a low-profile form factor with passive heatsink cooling, making it suitable for dense server deployments.

Advantages

This adapter provides exceptional throughput and efficiency for virtualized and containerized environments, with support for SR-IOV and VirtIO. Its stateless offloads (TCP/UDP/IP checksum, LSO, LRO, RSS) reduce CPU overhead, while Data Center Bridging (DCB) and Quality of Service (QoS) ensure predictable performance for critical workloads. The card is compliant with RoHS, CE, FCC, and UL standards, ensuring reliability and regulatory adherence.

Suitable for

• Cloud and hyperscale data centers
• High-performance computing (HPC) clusters
• Enterprise storage and networking
• Virtualized server environments (VMware, Hyper-V, KVM)

Key specifications

• Controller Chipset: Mellanox ConnectX-4 Lx EN
• Interface Type: PCI Express 3.0 x8
• Data Transfer Rate: 25 Gigabit Ethernet (25GbE)
• Port Configuration: Dual-port SFP28
• Form Factor: Low-profile PCIe Add-in Card
• Supported Protocols: Ethernet, RoCE, VXLAN, NVGRE, Geneve
• Virtualization Support: SR-IOV, VirtIO
• Offload Capabilities: Stateless offloads, RDMA offloads
• Jumbo Frame Support: Up to 9KB
• Operating System Compatibility: Windows Server, Linux (RHEL, SLES, Ubuntu, Fedora), VMware ESXi, FreeBSD
• Power Consumption: Typically 10-12W (max)
• Thermal Solution: Passive heatsink
• Management Features: NC-SI, SMBus, IPMI
• Connector Type: SFP28
• Compliance: RoHS, CE, FCC, UL

Recommendations

For optimal performance, pair this card with compatible SFP28 transceivers and cables. Ensure your system has an available PCIe 3.0 x8 slot and adequate airflow for passive cooling. This card is ideal for building high-speed, low-latency networks in data center environments.