How many network ports does the MCX4121A-ACAT provide, and what connector and transmission media types can be used with them?

It provides two ports. Both are SFP28 interfaces and support copper or optical connections, giving the server two independent Ethernet network interfaces.

Which Ethernet data rates can the MCX4121A-ACAT run on each of its two SFP28 network interfaces?

1GbE, 10GbE, and 25GbE per port. Each SFP28 interface can operate at a supported Ethernet rate when connected to compatible cabling and network equipment.

What PCIe host interface does the MCX4121A-ACAT use, and can it operate with earlier PCIe generations?

PCIe Gen3 x8. The adapter uses eight lanes at 8.0 GT/s and is backward compatible with PCIe Gen2 and PCIe Gen1.1 host interfaces.

Does the MCX4121A-ACAT support InfiniBand networking, or is it designed only for Ethernet server connections?

Ethernet only. The MCX4121A-ACAT is a ConnectX-4 Lx EN adapter, and its documented network modes are 1GbE, 10GbE, and 25GbE rather than InfiniBand or VPI.

Can the MCX4121A-ACAT handle RoCE-based RDMA traffic in low-latency Ethernet server and storage networks?

Yes. The ConnectX-4 Lx EN architecture provides native hardware support for RDMA over Converged Ethernet, enabling low-latency RDMA communication over Ethernet networks.

How can the MCX4121A-ACAT be a low-profile adapter while being supplied with a tall mounting bracket?

The adapter board is low profile, measuring 2.71 × 5.6 in. (68.90 × 142.24 mm), while the MCX4121A-ACAT ordering configuration includes a tall bracket for installation.

ConnectX-4 NICs

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NVIDIA/Mellanox MCX4121A-ACAT Mellanox ConnectX®-4 Lx EN Network Interface Card, 25GbE Dual-port SFP28, PCIe3.0x8, Tall Bracket

MCX4121A-ACAT

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ConnectX-4 NICs Overview

ConnectX-4 NICs includes one NVIDIA Mellanox ConnectX-4 Lx EN Ethernet adapter for server networking. The card provides dual-port SFP28 connectivity with Ethernet data rates of 1GbE, 10GbE, and 25GbE per port. It uses a low-profile PCIe Gen3 x8 form factor and is supplied with a tall bracket. The adapter supports copper and optical SFP28 connections and provides two independent Ethernet interfaces for server and data center network environments.

MCX4121A-ACAT is a low-profile ConnectX-4 Lx EN network interface card with two SFP28 ports supporting 1GbE, 10GbE, and 25GbE. It connects to the host through PCIe Gen3 x8 and remains compatible with PCIe Gen2 and Gen1.1 interfaces. The adapter supports copper and optical SFP28 connections and is supplied with a tall bracket for dual-port server Ethernet connectivity.

FAQ

How many network ports does the MCX4121A-ACAT provide, and what connector and transmission media types can be used with them?: It provides two ports. Both are SFP28 interfaces and support copper or optical connections, giving the server two independent Ethernet network interfaces.
Which Ethernet data rates can the MCX4121A-ACAT run on each of its two SFP28 network interfaces?: 1GbE, 10GbE, and 25GbE per port. Each SFP28 interface can operate at a supported Ethernet rate when connected to compatible cabling and network equipment.
What PCIe host interface does the MCX4121A-ACAT use, and can it operate with earlier PCIe generations?: PCIe Gen3 x8. The adapter uses eight lanes at 8.0 GT/s and is backward compatible with PCIe Gen2 and PCIe Gen1.1 host interfaces.
Does the MCX4121A-ACAT support InfiniBand networking, or is it designed only for Ethernet server connections?: Ethernet only. The MCX4121A-ACAT is a ConnectX-4 Lx EN adapter, and its documented network modes are 1GbE, 10GbE, and 25GbE rather than InfiniBand or VPI.
Can the MCX4121A-ACAT handle RoCE-based RDMA traffic in low-latency Ethernet server and storage networks?: Yes. The ConnectX-4 Lx EN architecture provides native hardware support for RDMA over Converged Ethernet, enabling low-latency RDMA communication over Ethernet networks.
How can the MCX4121A-ACAT be a low-profile adapter while being supplied with a tall mounting bracket?: The adapter board is low profile, measuring 2.71 × 5.6 in. (68.90 × 142.24 mm), while the MCX4121A-ACAT ordering configuration includes a tall bracket for installation.