---
product_id: 299179111
title: "ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT)"
brand: "mellanox"
price: "€ 170.42"
currency: EUR
in_stock: true
url: https://www.desertcart.it/products/299179111-connectx-4-lx-en-network-adapter-mcx4121a-acat
store_origin: IT
region: Italy
---

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

**Brand:** mellanox
**Price:** € 170.42
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate Your Network Game!

## Quick Answers

- **What is this?** ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT) by mellanox
- **How much does it cost?** € 170.42 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/299179111-connectx-4-lx-en-network-adapter-mcx4121a-acat)

## 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.
- • **Compact Powerhouse:** Lightweight design (81.65g) with robust performance, perfect for modern data centers.
- • **Virtualization Ready:** Cutting-edge performance in virtualized overlay networks for optimal resource utilization.
- • **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-ACAT) is engineered for high-performance networking, offering industry-leading throughput and low latency. Designed for data centers, it supports multi-host technology and is compatible with various computing platforms, making it a versatile choice for enhancing storage performance and maximizing ROI.

## Description

MellanoxConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT)

## 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 |
| Product Dimensions | 15.49 x 19.3 x 3.51 cm; 81.65 Grams |
| Item model number | MCX4121A-ACAT |
| Manufacturer | INGB9 Music Vendor Code |
| Wattage | 5 |
| Hardware Platform | PC;Unix |
| Are Batteries Included | No |
| Item Weight | 81.6 g |

## Product Details

- **Brand:** Mellanox
- **Color:** Assorted
- **Compatible Devices:** Desktop
- **Data Link Protocol:** 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 (MCX4121A-ACAT) - 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 Italy*
*Store origin: IT*
*Last updated: 2026-02-17*