What type of network adapter is the NVIDIA MCX4121A-ACAT?

The NVIDIA MCX4121A-ACAT is a PCIe 3.0 x8 Ethernet adapter configured as a 25GbE dual-port SFP28 card. It provides two 25GbE-capable ports using SFP28 interfaces, making it suitable for systems that require 25 Gigabit Ethernet connectivity from a PCIe 3.0 x8 expansion slot.

How many Ethernet ports does the MCX4121A-ACAT provide and at what speed?

The MCX4121A-ACAT provides dual Ethernet ports classified in the product data as a 25GbE dual-port SFP28 adapter. This means there are two SFP28 interfaces, each aligned with 25 Gigabit Ethernet operation, enabling two high-speed links from a single adapter card.

What host interface does the NVIDIA MCX4121A-ACAT require?

This adapter is specified as a PCIe 3.0 x8 Ethernet adapter, indicating that it uses a PCI Express 3.0 x8 host interface. It is intended for installation in systems that offer a compatible PCIe 3.0 x8 slot, allowing the dual-port 25GbE SFP28 functionality to be presented to the host.

Which connector type is used on the network ports of the MCX4121A-ACAT?

According to the product category, the MCX4121A-ACAT is a 25GbE dual-port SFP28 adapter. This indicates that each of the two Ethernet ports uses an SFP28 interface, which is the standard connector form factor associated with 25GbE links and compatible transceivers or cables.

Is the MCX4121A-ACAT suitable for environments standardizing on 25GbE?

Yes, the adapter is described as a 25GbE dual-port SFP28 PCIe 3.0 x8 Ethernet adapter. This aligns directly with environments that have chosen 25GbE as the primary server-edge speed, providing two 25GbE-capable SFP28 ports on a single PCIe 3.0 x8 card.

900-9X4B0-0053-0T1 - NVIDIA 900-9X4B0-0053-0T1 25GbE dual-port SFP28 adapter

Name: NVIDIA 900-9X4B0-0053-0T1 25GbE dual-port SFP28 adapter
Brand: NVIDIA
SKU: 900-9X4B0-0053-0T1
Price: 92 USD
Availability: InStock

900-9X4B0-0053-0T1 - NVIDIA 900-9X4B0-0053-0T1 25GbE dual-port SFP28 adapter | US IT Hardware

Product overview

The NVIDIA MCX4121A-ACAT is a 25GbE dual-port SFP28 network adapter designed for environments that require reliable Ethernet connectivity. Classified as a PCIe 3.0 x8 Ethernet adapter, it uses a PCI Express 3.0 x8 host interface, aligning with modern server and workstation platforms. Dual SFP28 networking ports support 25 Gigabit Ethernet operation across both interfaces, enabling flexible link configurations in data center and enterprise networks. The adapter fits into PCIe 3.0 x8 slots, providing an appropriate balance between bandwidth and compatibility with existing infrastructure. This product is identified by SKU 900-9X4B0-0053-0T1 for streamlined procurement and asset tracking. With its dual-port 25GbE SFP28 configuration and PCIe 3.0 x8 connectivity, the MCX4121A-ACAT offers a focused feature set for teams standardizing on 25GbE Ethernet at the server edge. Power consumption details are listed separately for capacity planning.

25GbE dual-port Ethernet connectivity
Dual SFP28 networking interfaces
PCIe 3.0 x8 host adapter form factor
NVIDIA MCX4121A-ACAT standardized model
Designed as a 25GbE SFP28 network adapter
Fits environments using PCIe 3.0 x8 slots

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Featuring

Product Type
Manufacturer part #	900-9X4B0-0053-0T1
Brand	NVIDIA
Condition	Refurbished
Model	MCX4121A-ACAT
Series	ConnectX-4 Lx EN
Generation	ConnectX-4 Lx
Technology	Ethernet
Device Type	Network adapter
Form Factor	Plug-in card
Message Rate	Up to 75 million packets per second
Product Line	ConnectX-4 Lx EN

Compatible systems

Confirmed as an NVIDIA ConnectX-4 Lx EN dual-port 25GbE SFP28 PCIe 3.0 x8 network adapter.

NVIDIA ConnectX-4 Lx EN
Model: MCX4121A-ACAT
Form factor: Plug-in card
Network adapter identified on NVIDIA docs and retailer listings.

Best for

Data center 25GbE deployments
Suitable for data center hosts standardizing on 25GbE, leveraging the dual-port SFP28 design to provide two 25GbE links on a PCIe 3.0 x8 Ethernet adapter.
Server edge connectivity
Designed for server connectivity where a PCIe 3.0 x8 slot is available and dual 25GbE SFP28 ports are required for upstream network links.
Network bandwidth upgrades
Useful for upgrading from lower-speed Ethernet adapters to 25GbE by using the MCX4121A-ACAT dual-port SFP28 capabilities on a PCIe 3.0 x8 interface.
Consolidated link configurations
Supports scenarios where two 25GbE SFP28 ports on a single PCIe 3.0 x8 adapter help consolidate multiple network links per server.

Frequently asked questions

Details

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RoCE Support	RDMA over Converged Ethernet (RoCE)

UEFI Enabled	Yes (adapter card is UEFI enabled)

Bracket Height	Tall bracket

Virtualization Features	Designed for virtualized infrastructure with SR-IOV and related virtualization offloads

Environmentally Friendly	Yes

Supported Operating Systems	FreeBSD, Microsoft Windows, CentOS

Performance

Typical Latency	Sub-microsecond latency
Media Type Supported	Optical fiber
Card Throughput Capability	Up to 50 Gb/s aggregate Ethernet bandwidth (2 × 25 Gb/s)
Maximum Ethernet Bandwidth	10/25 Gb/s Ethernet connectivity

Maximum Power Consumption	8 W (maximum)

Networking Ports & Interfaces

Port Type	SFP28
PCIe Lanes	x8
Port Count	2 ports
PCIe Version	PCIe 3.0
Connector Type	SFP28
Ethernet Speed	25GbE
Media Interface	Dual-port SFP28 for copper or optical fiber modules
Network Interface	Ethernet
Network Controller	ConnectX-4 Lx EN network controller
Expansion Slot Type	SFP
Supported Ethernet Rates	1 Gb/s, 10 Gb/s, and 25 Gb/s Ethernet modes via SFP28 interfaces
Maximum Data Rate Per Port	Up to 25 Gb/s per port
Supported Network Technology	25GBase-X

NVIDIA 900-9X4B0-0053-0T1 25GbE dual-port SFP28 adapter