---
product_id: 167703134
title: "ConnectX-4 Lx EN - Network adapter - PCIe 3.0 x8 - 25 Gigabit Ethernet x 2"
brand: "mellanox"
price: "₨93809"
currency: LKR
in_stock: true
category: "Mellanox"
url: https://www.desertcart.lk/products/167703134-connectx-4-lx-en-network-adapter-pcie-3-0-x8
store_origin: LK
region: Sri Lanka
---

# 25Gbps dual ports PCIe 3.0 x8 interface Optimized for virtualized servers ConnectX-4 Lx EN - Network adapter - PCIe 3.0 x8 - 25 Gigabit Ethernet x 2

**Brand:** mellanox
**Price:** ₨93809
**Availability:** ✅ In Stock

## Summary

> 🚀 Connect faster, scale smarter, and lead the network revolution!

## 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?** ₨93809 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/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

- • **Blazing 25 Gigabit Ethernet:** Experience ultra-fast data transfer speeds that keep your network ahead of the curve.
- • **Innovative Multi-Host Technology:** Revolutionize your rack design to slash CAPEX and OPEX without sacrificing speed.
- • **Virtualization-Ready Performance:** Host more VMs per server with reduced CPU load and enhanced throughput.
- • **Seamless PCIe 3.0 x8 Connectivity:** Maximize bandwidth with a high-speed interface designed for demanding workloads.
- • **OCP 2.0 Certified for Future-Proofing:** Stay on the cutting edge with Open Compute Project compliance ensuring top-tier network efficiency.

## Overview

The ConnectX-4 Lx EN is a high-performance network adapter featuring dual 25 Gigabit Ethernet ports and PCIe 3.0 x8 interface. Engineered for virtualized server environments, it boosts throughput and reduces CPU load, enabling more virtual machines per server. With Open Compute Project 2.0 compliance and innovative multi-host technology, it delivers superior network efficiency and cost savings for modern data centers.

## 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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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-09-24*