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A high-tech enterprise specializing in the research and development of optical fiber communications and manufacturing.
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A high-tech enterprise specializing in the research and development of optical fiber communications and manufacturing.
The KEXINT MCX4121A-ACAT is a high-performance 25GbE Dual-Port SFP28 Network Interface Card (NIC) engineered for modern AI data centers, cloud infrastructure, and high-density virtualized environments. Built on the original NVIDIA Mellanox ConnectX-4 Lx controller, this adapter provides up to 2.5 times the bandwidth of 10G networks while maintaining a similar power envelope, offering the most cost-effective ROI path for enterprises transitioning from 10G to 25G architectures.
Its core advantage lies in comprehensive support for RoCE (RDMA over Converged Ethernet), delivering sub-microsecond latency and significantly enhancing the efficiency of NVMe-over-Fabrics (NVMe-oF) storage and high-performance computing (HPC) clusters. Furthermore, by integrating advanced hardware offload engines—including VXLAN, NVGRE, and Geneve—it effectively reduces CPU overhead, ensuring robust system performance even under heavy network traffic.
Equipped with a standard 4.72 in (120mm) tall bracket, the card strictly adheres to US engineering and international installation standards, making it the preferred choice for IT architects and system integrators seeking superior I/O performance and long-term reliability.
Product Description
The KEXINT MCX4121A-ACAT is a professional-grade NVIDIA Mellanox ConnectX-4 Lx EN network interface card designed to meet the rigorous demands of modern AI-driven data centers and high-scale cloud infrastructures. Delivering high-speed 25GbE dual-port connectivity through its SFP28 interfaces and utilizing a PCIe 3.0 x8 host interface, this adapter is the cornerstone for organizations looking to transition from traditional 10G networks to high-performance 25G architectures without significantly increasing power consumption or operational complexity.
Product Highlights
● 25GbE Dual-Port SFP28
● PCIe3.0 x8 Interface
● High Performance
● Enhanced Data Security
● Optimized for Cloud
Product Features Comparison
| Model | MCX4121A-ACAT | MCX5121A-ACAT | MCX4131A-BCAT | MCX515A-CCAT | MCX516A-CDAT | MCX511A-ACAT | MCX416A-BCAT |
| Ports | 2 x 25GbE | 2 x 40GbE | 2 x 40GbE | 1 x 100GbE | 2 x 100GbE | 1 x 25GbE | 1 x 40GbE |
| Interface | PCIe3.0 x8 | PCIe3.1 x8 | PCIe3.0 x8 | PCIe4.0 x8 | PCIe4.0 x16 | PCIe3.0 x8 | PCIe3.0 x8 |
| Speed | 25Gbps | 100Gbps | 40Gbps | 100Gbps | 100Gbps | 25Gbps | 40Gbps |
| Data Center | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| Cloud Optimization | Yes | Yes | YesYes | Yes | Yes | Yes | Yes |
Application Scenarios
● High-performance data centers
● Cloud-based applications
● Network-intensive environments
Optional Add-ons
| Model | Description |
| AOC-S25G20 | 25G SFP28 Active Optical Cable |
| MCX-CB25G-2M | 25G SFP28 Copper Cable, 2m |
| MFM1T02A-SRSP | 25G SFP28 SR Optical Transceiver |
Specification
| Brand | NVIDIA Mellanox | Connector Type | SFP28 |
| Model | MCX4121A-ACAT | Bus Interface | PCIe 3.0 x8 |
| Product Type | Network Interface Card (NIC) | Bracket Height | Tall Bracket |
| Network Interface | Ethernet | Form Factor | Plug-in Card |
| Network Speed | 25GbE | Standards Compliance | IEEE 802.3 |
| Ports | Dual-Port | Data Rate | Up to 25Gbps per port |
| Compatible Operating Systems | Windows, Linux, VMware | Power Consumption | Maximum 8W |
| Temperature Range | 0°C to 55°C (Operating) | Humidity Range | 5% to 95% (Operating) |
| Dimensions | 167.7mm x 68.9mm | Warranty | 1 Years |
| Regulatory Approvals | FCC, CE, RoHS | Latency | Low Latency |
| RDMA Support | Yes |
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