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Mellanox ConnectX-4 Lx MCX4121A-ACAT Dual-Port 25GbE Network Adapter Card
Product Details:
| Brand Name: | Mellanox |
| Model Number: | MCX4121A-ACAT |
| Document: | connectx-4-lx-en-card.pdf |
Payment & Shipping Terms:
| Minimum Order Quantity: | 1pcs |
|---|---|
| Price: | Negotiate |
| Packaging Details: | outer box |
| Delivery Time: | Based on inventory |
| Payment Terms: | T/T |
| Supply Ability: | Supply by project/batch |
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Detail Information |
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| 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 |
| Highlight: | Mellanox ConnectX-4 Lx 25GbE network card,dual-port 25GbE network adapter,Nvidia ConnectX-4 Lx Ethernet card |
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Product Description
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 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.
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