--- product_id: 83883544 title: "Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT)" brand: "mellanox" price: "R2904" currency: ZAR in_stock: true category: "Mellanox" url: https://www.desertcart.co.za/products/83883544-mellanox-connectx-4-lx-en-network-adapter-mcx4121a-acat store_origin: ZA region: South Africa --- # 25.6 Gbps blazing throughput multi-host tech for max ROI ultra-low latency for real-time response Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT) **Brand:** mellanox **Price:** R2904 **Availability:** ✅ In Stock ## Summary > 🚀 Elevate your data center game with ConnectX-4 Lx EN — where speed meets smart savings! ## Quick Answers - **What is this?** Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT) by mellanox - **How much does it cost?** R2904 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/83883544-mellanox-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 - • **Multi-Host Technology:** Revolutionize your rack design with multi-host support that slashes CAPEX and OPEX. - • **Open Compute Project Ready:** Built to OCP 2.0 specs, ensuring future-proof compatibility and industry-leading innovation. - • **Blazing 25.6 Gbps Throughput:** Experience lightning-fast data transfer that keeps your network ahead of the curve. - • **Ultra-Low Latency Performance:** Cut delays to near zero for seamless virtualized environments and real-time applications. - • **Cross-Platform Smart Interconnect:** Optimized for x86, Power, ARM, and GPU platforms to unify your compute and storage seamlessly. ## Overview The Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT) delivers industry-leading 25.6 Gbps Ethernet throughput and ultra-low latency, optimized for virtualized server environments. Featuring multi-host technology and Open Compute Project 2.0 form factor, it maximizes data center ROI by enabling innovative rack designs and supporting diverse compute platforms including x86, Power, ARM, and GPU. Ideal for professionals demanding cutting-edge network performance and efficiency. ## 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 - 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 | |---------------|-------| | ASIN | B011HVAZ78 | | Best Sellers Rank | #164 in Internal Computer Networking Cards | | Brand | Mellanox | | Built-In Media | Mellanox network adapter | | Color | Assorted | | Compatible Devices | Desktop | | Customer Reviews | 3.8 out of 5 stars 9 Reviews | | Data Link Protocol | 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 | | Mfr Part Number | MCX4121A-ACAT | | Model Number | MCX4121A-ACAT | | Unit Count | 1.0 Count | | Warranty Description | Unspecified | ## 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 - **Unit Count:** 1.0 Count ## Images ![Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT) - Image 1](https://m.media-amazon.com/images/I/612n71ocDLL.jpg) ![Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT) - Image 2](https://m.media-amazon.com/images/I/61wMYcPhIuL.jpg) ![Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT) - Image 3](https://m.media-amazon.com/images/I/51uOlokfGAL.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) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/83883544-mellanox-connectx-4-lx-en-network-adapter-mcx4121a-acat](https://www.desertcart.co.za/products/83883544-mellanox-connectx-4-lx-en-network-adapter-mcx4121a-acat) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-07-09*