---
product_id: 167703134
title: "ConnectX-4 Lx EN - Network adapter - PCIe 3.0 x8 - 25 Gigabit Ethernet x 2"
brand: "mellanox"
price: "€ 233.05"
currency: EUR
in_stock: true
category: "Mellanox"
url: https://www.desertcart.hr/products/167703134-connectx-4-lx-en-network-adapter-pcie-3-0-x8
store_origin: HR
region: Croatia
---

# 25 Gbps blazing speed PCIe 3.0 x8 high-throughput interface Dual-port Ethernet connectivity ConnectX-4 Lx EN - Network adapter - PCIe 3.0 x8 - 25 Gigabit Ethernet x 2

**Brand:** mellanox
**Price:** € 233.05
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your network game with Mellanox ConnectX-4 Lx EN — where speed meets smart efficiency!

## Quick Answers

- **What is this?** ConnectX-4 Lx EN - Network adapter - PCIe 3.0 x8 - 25 Gigabit Ethernet x 2 by mellanox
- **How much does it cost?** € 233.05 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/167703134-connectx-4-lx-en-network-adapter-pcie-3-0-x8)

## Best For

- mellanox enthusiasts

## Why This Product

- Trusted mellanox brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **PCIe 3.0 x8 Interface:** Leverage high-bandwidth PCIe 3.0 x8 for minimal bottlenecks and peak server performance.
- • **Blazing 25 Gbps Throughput:** Experience ultra-fast data transfer that powers real-time responses and seamless virtualization.
- • **Multi-Host Technology Innovation:** Unlock next-gen rack designs that slash CAPEX and OPEX without sacrificing network speed.
- • **Dual-Port Ethernet for Maximum Uptime:** Stay connected with redundant 2x 25 Gigabit Ethernet ports designed for mission-critical environments.
- • **Optimized for Virtualized Environments:** Boost VM density and reduce CPU load with advanced offloading tailored for modern data centers.

## Overview

The Mellanox ConnectX-4 Lx EN is a cutting-edge dual-port 25 Gigabit Ethernet network adapter featuring PCIe 3.0 x8 interface. Designed for high-performance server and storage applications, it delivers ultra-low latency, enhanced throughput, and advanced multi-host technology to optimize virtualized environments and reduce operational costs.

## Description

With ConnectX-4 Lx EN, server and storage applications will achieve significant throughput and latency improvements resulting in faster access, real-time response and more virtual machines hosted per server. ConnectX-4 Lx EN for Open Compute Project (OCP) specification 2.0 improves network performance by increasing available bandwidth while decreasing the associated transport load on the CPU especially in virtualized server environments. Moreover, ConnectX-4 Lx EN introduces the multi-host technology, which enables a new innovative rack design that achieves maximum CAPEX and OPEX savings without compromising on network performance.

## Features

- Connectivity technology: ethernet

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B011HVAZ78 |
| Best Sellers Rank | 249,953 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 1,073 in Network Cards |
| Box Contents | Mellanox network adapter |
| Brand Name | Mellanox |
| Color | Green |
| Compatible Devices | Desktop |
| Compatible Operating System Family | Linux, Windows |
| Data Link Protocol | Ethernet, Gigabit Ethernet |
| Data Transfer Rate | 25600 Megabits Per Second |
| Global Trade Identification Number | 07290107197861 |
| Hardware Interface | PCIE x 8 |
| Item Type Name | ConnectX-4 Lx EN Network Adapter |
| Item Weight | 0.18 Pounds |
| Manufacturer | INGB9 Music Vendor Code |
| Manufacturer Part Number | MCX4121A-ACAT |
| Model Number | MCX4121A-ACAT |
| Unit Count | 2.0 count |

## Product Details

- **Brand:** Mellanox
- **Colour:** Green
- **Compatible Operating System Family:** Linux, Windows
- **Compatible devices:** Desktop
- **Data link protocol:** Ethernet, Gigabit Ethernet
- **Data transfer rate:** 25600 Megabits Per Second
- **Global Trade Identification Number:** 07290107197861
- **Hardware interface:** PCIE x 8
- **Item weight:** 0.18 Pounds
- **Manufacturer:** INGB9 Music Vendor Code

## Images

![ConnectX-4 Lx EN - Network adapter - PCIe 3.0 x8 - 25 Gigabit Ethernet x 2 - Image 1](https://m.media-amazon.com/images/I/612n71ocDLL.jpg)

## Questions & Answers

**Q: Can a unifi SFP cable be connected to this card directly?**
A: If you mean the copper SFP28 DAC cable, then yes.  I am currently using that.  For a fiber cable, you need a transceiver.

**Q: Does this come with a low profile adapter?**
A: Yes.

**Q: I have a qnap 873e w/qxg-10g1t add-in. will the mcx4121a-acat 25gigabit ethernet card support this using cat7? what speed could i expect?**
A: This NIC uses SFP28 adaptor.
If you use SFP+ transceiver with 10G base-T, you will get 10G speed

**Q: Does this item ship with both tall bracket and short bracket ? Or only with tall bracket, as in the picture ?**
A: Both

## Frequently Bought Together

- Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT)
- 10Gtek 25G SFP28 SFP+ SR Transceiver, 25GBase-SR Duplex LC MMF Optical Module for Mellanox MMA2P00-AS, 850nm, DDM, up to 100m
- 10GTEK 25G SFP28 SFP+ DAC Cable - 25GBASE-CR SFP28 to SFP28 Passive Direct Attach Copper Twinax Cable for Cisco SFP-H25GB-CU2M, Ubiquiti UC-DAC-SFP28, Supermicro and More, 2-Meter(6.6ft)

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**Shop now:** [https://www.desertcart.hr/products/167703134-connectx-4-lx-en-network-adapter-pcie-3-0-x8](https://www.desertcart.hr/products/167703134-connectx-4-lx-en-network-adapter-pcie-3-0-x8)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-05-19*