Dell Mellanox ConnectX-4 LX 25GbE CX4121C Dual Port Network Adapter

The Dell MRT0D is a network adapter that uses the Mellanox ConnectX-4 LX controller to give a server two 25 gigabit Ethernet ports through an SFP28 interface. It installs in a PCI Express Gen3 x8 slot, so you can add high-bandwidth links without occupying a full x16 lane or relying on proprietary connections.

This card shines in environments where every microsecond of latency and every CPU cycle matter. Built-in hardware engines handle VXLAN and NVGRE tunneling, which means overlay traffic is processed on the adapter itself instead of the host processor. The result is lower overhead and steadier performance—even when a virtualized workload, a cloud node, or a high performance computing cluster is pushing large east-west data flows.

If you run dense virtualization hosts, data-intensive analytic jobs, or a private cloud that needs fast east-west traffic, the MRT0D offers a direct path to higher throughput without a major platform change. Slot it into compatible Dell PowerEdge servers or other PCIe Gen3 systems, attach two 25 GbE links, and immediately raise the ceiling for storage traffic, VM migration, and clustered application messaging.

• Two 25 gigabit Ethernet ports with SFP28 optical or direct-attach cable support
• PCI Express Gen3 x8 host interface for high bus bandwidth
• Onboard offload engines for VXLAN and NVGRE overlay processing
• Consistent low latency that reduces CPU load during heavy network traffic
• Designed for enterprise data centers, private or public cloud deployments, and high performance computing clusters