---
product_id: 90938552
title: "ConnectX-4 Lx EN Network Adapter (MCX4121A-XCAT)"
brand: "mellanox"
price: "€ 209.99"
currency: EUR
in_stock: true
url: https://www.desertcart.ie/products/90938552-connectx-4-lx-en-network-adapter-mcx4121a-xcat
store_origin: IE
region: Ireland
---

# Low latency Multi-host tech High throughput ConnectX-4 Lx EN Network Adapter (MCX4121A-XCAT)

**Brand:** mellanox
**Price:** € 209.99
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate Your Network Game!

## Quick Answers

- **What is this?** ConnectX-4 Lx EN Network Adapter (MCX4121A-XCAT) by mellanox
- **How much does it cost?** € 209.99 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/90938552-connectx-4-lx-en-network-adapter-mcx4121a-xcat)

## 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

- • **Maximize Your ROI:** Leverage multi-host technology to enhance your data center's return on investment.
- • **Virtualization Ready:** Cutting-edge performance in virtualized overlay networks for optimal efficiency.
- • **Lightweight Powerhouse:** Weighing just 5.5 ounces, this adapter packs a punch without the bulk.
- • **Unleash Unmatched Speed:** Experience industry-leading throughput and low latency for seamless web access and storage performance.
- • **Versatile Compatibility:** Smart interconnect for x86, Power, ARM, and GPU-based platforms ensures flexibility.

## Overview

The Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-XCAT) is designed for high-performance computing environments, offering exceptional throughput and low latency. Its multi-host technology maximizes ROI for data centers, while its compatibility with various computing platforms ensures versatility. Weighing only 5.5 ounces, it delivers powerful performance in a compact form factor.

## Description

ConnectX-4 Lx EN Network Adapter (MCX4121A-XCAT)

## Features

- Open compute project form factor
- Industry-leading throughput and low latency for web access and storage performance
- Maximizing data centers' return on investment (ROI) with multi-host technology
- Smart interconnect for x86, Power, ARM, and GPU-based compute and storage platform
- Cutting-edge performance in virtualized overlay networks

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Mellanox |
| Item model number | MCX4121A-XCAT |
| Hardware Platform | PC;Unix |
| Item Weight | 5.5 ounces |
| Product Dimensions | 8.35 x 6.5 x 2.3 inches |
| Item Dimensions  LxWxH | 8.35 x 6.5 x 2.3 inches |
| Color | black |
| Batteries | 1 Lithium Ion batteries required. |
| Manufacturer | INGB9 Music Vendor Code |
| Language | English, English, English, English, English |
| ASIN | B019MRAM72 |
| Is Discontinued By Manufacturer | No |
| Date First Available | December 21, 2015 |

## Product Details

- **Brand:** Mellanox
- **Hardware Interface:** PCIE x 8
- **Color:** black
- **Compatible Devices:** Laptop, Desktop
- **Data Link Protocol:** Ethernet
- **Data Transfer Rate:** 10240 Megabits Per Second
- **Global Trade Identification Number:** 07290107197878
- **Manufacturer:** INGB9 Music Vendor Code

## Images

![ConnectX-4 Lx EN Network Adapter (MCX4121A-XCAT) - Image 1](https://m.media-amazon.com/images/I/612n71ocDLL.jpg)

## Questions & Answers

**Q: Does this come with half-height, full-height or both brackets?**
A: The ones I received came with both brackets.

**Q: Are the slots qsfp or sfp+?**
A: They can support 10Gbps (sfp) and 25Gbps with SFP-128 cables that I use to connect server to Synology NAS (both with this Mellanox card).  I don't believe that they support qsfp because I believe that would be 100Gbps (I believe you have to move up to the ConnectX-5 card for that).

**Q: Can this card be installed in a "generic" server or only in an OCP system?**
A: They can be installed in "generic" server if it has required slots.

## Frequently Bought Together

- Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-XCAT)
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- Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT)

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-21*