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Hong Kong Starsurge Group Co., Limited

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  3. Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card
China Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card
China Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card

  1. China Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card
  2. China Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card
  3. China Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card
  4. China Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card
  5. China Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card
  6. China Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card

Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card

  1. MOQ： 1pcs
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Payment Terms T/T
Supply Ability Supply by project/batch
Delivery Time Based on inventory
Packaging Details outer box
Application Server
Interface Type: network
Ports Dual
Max Speed 25GbE
Connector Type SFP28
Type wired
Condition new and original
model MCX4121A-ACAT
name Mellanox Network Card ConnectX-4 Lx EN 25GbE Dual-Port SFP28 PCIe3.0 x8 Network Interface Card MCX4121A-ACAT
keyword Mellanox Network Card
Brand Name Mellanox
Model Number MCX4121A-ACAT

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  1. Product Details
  2. Company Details

Product Specification

Payment Terms T/T Supply Ability Supply by project/batch
Delivery Time Based on inventory Packaging Details outer box
Application Server Interface Type: network
Ports Dual Max Speed 25GbE
Connector Type SFP28 Type wired
Condition new and original model MCX4121A-ACAT
name Mellanox Network Card ConnectX-4 Lx EN 25GbE Dual-Port SFP28 PCIe3.0 x8 Network Interface Card MCX4121A-ACAT keyword Mellanox Network Card
Brand Name Mellanox Model Number MCX4121A-ACAT
High Light Mellanox ConnectX-4 Lx 25GbE network card ，dual-port 25GbE network adapter ，Nvidia ConnectX-4 Lx Ethernet card
NVIDIA ConnectX-4 Lx EN MCX4121A-ACAT Dual-Port 25GbE Network Adapter
Dual-port SFP28 25GbE Ethernet adapter card delivering 25/10/1GbE speeds, RDMA over Converged Ethernet (RoCE), and hardware-based virtualization offloads. Ideal for cloud, Web 2.0, database, AI, and storage platforms requiring high-bandwidth, low-latency connectivity.
Product Overview
The NVIDIA ConnectX-4 Lx EN MCX4121A-ACAT is a dual-port 25GbE Ethernet adapter card designed for data centers that demand high throughput, sub-microsecond latency, and efficient server utilization. Built on the proven ConnectX-4 Lx architecture, this adapter supports 25GbE, 10GbE, and 1GbE speeds, making it a flexible solution for enterprises upgrading from 10GbE to 25GbE infrastructure.
Key Features
  • Dual-Port 25GbE: Two SFP28 ports supporting 25GbE, 10GbE, and 1GbE speeds with backward compatibility
  • RDMA over Converged Ethernet (RoCE): Low-latency, high-performance RDMA services over Layer 2 and Layer 3 networks
  • Hardware I/O Virtualization: SR-IOV supports up to 256 Virtual Functions (VFs) and 8 Physical Functions per port
  • Overlay Network Offloads: Hardware encapsulation and de-encapsulation for VXLAN, NVGRE, and GENEVE
  • CPU Offload Engines: TCP/UDP stateless offloads, LSO/LRO, checksum offload, RSS/TSS, and intelligent interrupt coalescence
  • Host Management and UEFI: NC-SI over MCTP for BMC integration, remote boot over iSCSI, PXE, and UEFI support
Technical Specifications
Category Specification
Model MCX4121A-ACAT
Form Factor Low-profile PCIe add-in card (14.2cm x 6.9cm without bracket)
Ports 2x SFP28 (25GbE / 10GbE / 1GbE)
Host Interface PCIe 3.0 x8 (compatible with x16, x4, x2, x1)
Message Rate 75 million packets per second (Mpps)
Latency Sub-microsecond (typical)
Virtualization SR-IOV: up to 256 Virtual Functions, 8 Physical Functions per port
RoCE Support Yes – RDMA over Converged Ethernet (RoCE)
Overlay Offloads VXLAN, NVGRE, GENEVE hardware encapsulation and de-encapsulation
Operating Temperature 0°C to 55°C (typical)
Key Performance Facts
Dual-port 25GbE SFP28
75 Mpps message rate
Sub-microsecond latency
RoCE supported
256 SR-IOV Virtual Functions
VXLAN/NVGRE offload
PCIe 3.0 x8
UEFI enabled
Typical Deployments
  • Cloud and Web 2.0: High-density virtualization hosts requiring 25GbE connectivity
  • Storage Servers: iSCSI, NVMe-oF, and SMB Direct over RoCE for high-performance access
  • Database and Analytics: Low-latency RDMA accelerates distributed databases and big data frameworks
  • AI and GPU Clusters: PeerDirect enables direct GPU-to-GPU communication
  • 25GbE Data Center Migration: Seamless upgrade from 10GbE while maintaining backward compatibility
Compatibility
Operating Systems: RHEL/CentOS 7/8/9, Ubuntu 18.04+, Windows Server 2016/2019/2022, FreeBSD 12+, VMware ESXi 6.7/7.0/8.0, Citrix XenServer
Switches: NVIDIA Spectrum SN3000/SN3700 series, Cisco Nexus 3000/9000, Arista 7000 series, Juniper QFX series, any standards-based 25GbE/100GbE switch
Frequently Asked Questions
What is the difference between MCX4121A-ACAT and MCX4121A-XCAT?
MCX4121A-ACAT supports up to 25GbE speeds, while MCX4121A-XCAT supports up to 10GbE. Both are dual-port SFP28 adapters.
Does this card support RDMA over Ethernet?
Yes. The ConnectX-4 Lx EN supports RoCE (RDMA over Converged Ethernet) for low-latency memory access across the network.
Can I use this adapter with a PCIe 4.0 slot?
The card is PCIe 3.0 x8 but is backward compatible with PCIe 4.0 slots (operating at PCIe 3.0 speeds). No performance penalty.
About Hong Kong Starsurge Group
Hong Kong Starsurge Group Co., Limited - network hardware provider
Hong Kong Starsurge Group Co., Limited is a technology-driven provider of network hardware, IT services, and system integration since 2008. Serving government, healthcare, manufacturing, finance, education, and enterprise clients worldwide with reliable quality, responsive service, and tailored network infrastructure solutions.

Company Details

Bronze Gleitlager

,

Bronze Sleeve Bushings

 and 

Graphite Plugged Bushings

 from Quality China Factory

  • Business Type:

    Distributor/Wholesaler,Agent,Exporter,Trading Company,Seller,Other

  • Year Established:

    2008

  • Employee Number:

    50~200

  • Ecer Certification：

    Verified Supplier

Hong Kong Starsurge Group Co. Leading IT Solutions Provider & System Integrator Since Establishment Hong Kong Starsurge Group Co. is a technology-driven enterprise specializing in IT network system integration, IoT solutions, and custom software development. With extensive industry expertise ac... Hong Kong Starsurge Group Co. Leading IT Solutions Provider & System Integrator Since Establishment Hong Kong Starsurge Group Co. is a technology-driven enterprise specializing in IT network system integration, IoT solutions, and custom software development. With extensive industry expertise ac...

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Get in touch with us

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  • Hong Kong Starsurge Group Co., Limited
  • FLAT 2304, 23/F HO KING, COMMERCIAL CENTRE, 2-16 FAYUEN STREET, MONG KOK KOWLOON HONG KONG
  • https://www.mellanoxnetwork.com/

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