How does the MCX4421A-ACUN connect to the host server?

The MCX4421A-ACUN connects to the host using a PCIe 3.0 x8 interface in an OCP 2.0 context. This means the adapter uses eight lanes of PCI Express 3.0 to communicate with the server platform, providing a high-bandwidth path suitable for handling dual 25GbE traffic in datacenter deployments.

Is the MCX4421A-ACUN suitable for datacenter environments?

Yes, the MCX4421A-ACUN is classified at the datacenter product level. It combines 25GbE dual-port SFP28 connectivity with a PCIe 3.0 x8 OCP 2.0 interface, characteristics commonly used in modern datacenter server designs. Its datacenter designation helps ensure it aligns with typical rack-level networking architectures.

Does this adapter include host management capabilities?

This adapter is described as operating without host management. That means it does not rely on onboard host management features on the network adapter itself. Instead, it is intended for environments where management functions are provided by other platform components or separate management solutions in the datacenter.

Which product identifier should be used for procurement and inventory?

For procurement and inventory tracking, you can use the model designation ConnectX-4 Lx EN MCX4421A-ACUN along with the SKU 900-9X414-0053-SN0. These identifiers uniquely reference this specific 25GbE dual-port SFP28 Ethernet adapter, helping avoid confusion with other ConnectX-4 Lx variants.

900-9X414-0053-SN0 - NVIDIA 900-9X414-0053-SN0 25GbE dual-port SFP28 adapter

Name: NVIDIA 900-9X414-0053-SN0 25GbE dual-port SFP28 adapter
Brand: NVIDIA
SKU: 900-9X414-0053-SN0
Price: 72 USD
Availability: InStock

900-9X414-0053-SN0 - NVIDIA 900-9X414-0053-SN0 25GbE dual-port SFP28 adapter | US IT Hardware

Product overview

The NVIDIA ConnectX-4 Lx EN MCX4421A-ACUN is a datacenter network adapter designed for Open Compute Project environments that require 25GbE connectivity. This adapter provides 25GbE dual-port SFP28 interfaces, enabling high-speed Ethernet links through SFP28 optical modules or direct attach cables. It connects to the host system via a PCIe 3.0 x8 interface, aligned with OCP 2.0 specifications, to support efficient data paths between servers and the network fabric. The adapter is described as operating without host management, which suits deployments where out-of-band or separate management solutions are preferred. Positioned at the datacenter product level, it targets environments that standardize on 25GbE access networks and OCP 2.0 form factors. With its dual-port SFP28 configuration and PCIe 3.0 x8 connectivity, the ConnectX-4 Lx EN MCX4421A-ACUN supports scalable Ethernet networking in modern server platforms.

25GbE dual-port SFP28 network connectivity
PCIe 3.0 x8 interface for host connection
OCP 2.0 aligned Ethernet adapter design
Datacenter product level classification
Operates without host management features
ConnectX-4 Lx EN MCX4421A-ACUN model

Expedited and overnight shipping options are available at checkout, priced by destination and service.
Purchase orders accepted from qualified institutions.
Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Featuring

OCP Specification
Manufacturer part #	900-9X414-0053-SN0
Brand	NVIDIA
Condition	Refurbished
Model	MCX4421A-ACUN
Bracket	No bracket
Category	Peripheral, Network Card
Form Factor	OCP 2.0 Type 1 card
Product Line	ConnectX-4 Lx EN
Product Type	Network interface card for OCP
UEFI Support	UEFI enabled
Brand Association	NVIDIA, Mellanox

Best for

OCP 2.0 server integration
Suitable for datacenter servers built around OCP 2.0 specifications that require a PCIe 3.0 x8 network adapter, aligning host connectivity with standardized Open Compute platforms.
25GbE datacenter access
Designed for environments standardizing on 25GbE where dual-port SFP28 interfaces are used to connect servers to top-of-rack or aggregation switches.
Dual-port SFP28 consolidation
Supports scenarios where two 25GbE SFP28 ports on a single adapter are needed to aggregate bandwidth, separate traffic domains, or provide redundant Ethernet paths.
Host management offload environments
Appropriate for deployments that run without host management on the adapter, using alternative management mechanisms in the server or network infrastructure.
Datacenter network refresh
Useful in datacenter refresh projects that move from lower Ethernet speeds to 25GbE while retaining PCIe 3.0 x8 and OCP 2.0 compatibility on server platforms.

Frequently asked questions

What Ethernet connectivity does the NVIDIA ConnectX-4 Lx EN MCX4421A-ACUN provide?

Details

Shipping, warranty & returns

Customer reviews

No reviews yet — be the first to review this part.

PCI Express Generation	PCI Express 3.0

Networking Ports & Interfaces

Ports	2 x SFP28
Management	Without host management
Host Interface	PCIe 3.0 x8
Port Speed per Port	25 Gb/s per port
Number of Ethernet Ports	2 Ports
Supported Ethernet Speed	25 GbE; 10 GbE; 1 GbE