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Mellanox MCX4121A-ACAT ConnectX 4 Ethernet Adapter Card 25GbE Dual-Port SFP28 PCIe 3×8

Dual-port 25GbE SFP28 PCIe 3.0 x8 adapter delivering ultra-low latency, high throughput (up to 200 Gbps aggregate), and advanced hardware offloads for data-intensive workloads. Features include RDMA/RoCE v2, NVMe-oF support, and PCIe switch scalability, optimizing performance for cloud, AI, storage, and HPC environments. Energy-efficient design with backward compatibility (10/25GbE) ensures seamless integration into existing infrastructure. Unique selling points: industry-leading efficiency for latency-sensitive applications, robust virtualization (SR-IOV), and end-to-end QoS, backed by Mellanox/NVIDIA’s reliability. Ideal for enterprises prioritizing scalable, future-proof networking with reduced CPU overhead.

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Product Spotlights

 

CPU Offloads:

RDMA over Converged Ethernet (RoCE)

TCP/UDP/IP stateless offload

LSO, LRO, checksum offload

RSS (can be done on encapsulated packet), TSS, VLAN insertion/ stripping, Receive flow steering

Intelligent interrupt coalescence

 

Hardware-Based I/O Virtualization:

Single Root IOV

Multi-function per port

Address translation and protection

Multiple queues per virtual machine

Enhanced QoS for vNICs

VMware NetQueue support

 

Enhanced Features:

Hardware-based reliable transport

Collective operations offloads

Vector collective operations offloads

Extended Reliable Connected transport (XRC)

Dynamically Connected transport (DCT)

Enhanced Atomic operations

Advanced memory mapping support, allowing user mode registration and remapping of memory (UMR)

On demand paging (ODP)

registratio

RDMA Technology Empowers EDC and HPC

RDMA allows real CPU offloads and kernel bypass, and, as such, RDMA-based applications provide better utilization of network HW resources while increasing speed and lowering link latencies.

The Mellanox MCX4121A-ACAT ConnectX-4 Ethernet Adapter Card offers exceptional performance for high-speed networking. Featuring dual-port 25GbE SFP28 connectivity and a PCIe 3.0 x8 interface, this adapter card is designed for demanding data center and enterprise workloads. With support for advanced offloading capabilities, low-latency performance, and scalable solutions, the MCX4121A-ACAT ensures seamless operation for virtualization, storage, and cloud environments. Perfect for upgrading your network to next-generation speeds and reliability.

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