# Network Card Mellanox Technologies MCX4121A-ACAT

**URL:** https://aio.lv/en/product--mellanox-mcx4121a-acat--1020263
**Data updated:** 2025-12-29 05:26 (EET)
**Category:** Network Cards
**Manufacturer:** MELLANOX
**Manufacturer code:** MCX4121A-ACAT
**EAN:** 7290107197861
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 145.99 €
**Prices and availability valid until:** 2026-07-23 23:59
**Price without VAT (21%):** 120.65 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--mellanox-mcx4121a-acat--1020263

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

The Mellanox Technologies MCX4121A-ACAT is an internal fiber network card designed for high-speed connectivity. It features wired connectivity technology and utilizes a PCI Express host interface. This card supports fiber interfaces, ensuring reliable and fast data transmission for demanding applications. Ideal for data centers and enterprise environments, it enhances network performance and efficiency.

## Long description

The Mellanox Technologies MCX4121A-ACAT is an internal fiber network card based on the ConnectX-4 Lx EN controller, offering 1/10/25/40/50 Gb/s Ethernet connectivity for demanding virtualized and high-performance environments. Designed for data centers and enterprise deployments, this PCI Express card supports fiber interfaces and provides hardware-based I/O isolation, scalable network performance and support for advanced features such as RDMA and overlay network encapsulation/decapsulation.
Advantages
This network card delivers multi-rate Ethernet speeds up to 50 Gb/s and is optimized for virtualized infrastructures, providing hardware I/O isolation and high scalability. It supports RDMA for low-latency, high-throughput data transfers and overlay network functions for flexible network virtualization. The fiber interface and PCI Express host connection ensure reliable, high-bandwidth links suitable for intensive data analytics, cloud and storage platforms.
Suitable for
Data centers requiring high-bandwidth fiber connectivity
Virtualized server environments and cloud platforms
High-performance computing and data analytics
Database and storage servers needing low-latency transfers
Key specifications
Brand: MELLANOX
Model / MPN: MCX4121A-ACAT
Controller: ConnectX-4 Lx EN
Supported speeds: 1/10/25/40/50 Gb/s Ethernet
Interface: Fiber (optical) network ports
Host interface: PCI Express
Features: RDMA, overlay network encapsulation/decapsulation, hardware-based I/O isolation
EAN: 7290107197861
How to use
Install the MCX4121A-ACAT into an available PCI Express slot on a compatible server motherboard and connect fiber-optic cables to the card's optical ports. Ensure device drivers and firmware provided by the manufacturer are installed and updated on the host system. Configure network settings and enable RDMA or overlay network features as required by your virtualized or storage environment. Verify link status and run throughput or latency tests to confirm performance.
Usage recommendations
Use multimode or single-mode fiber and transceivers that match the card's optical specifications and your data center cabling. Keep firmware and drivers current, and follow vendor guidelines for jumbo frames, flow control and offload settings to achieve optimal performance in RDMA and overlay network deployments.

## Specifications

### Ports & interfaces

| Feature | Value |
|---|---|
| Connectivity technology | Wired |
| Interface | Fiber |
| Host interface | PCI Express |
| Internal | Yes |
| Fiber ports quantity | 2 |
| Fiber optic connector | SFP28 |
| PCI version | 3.0 |

### Bandwidth

| Feature | Value |
|---|---|
| Data transfer rate | 25 GT/s |

### Network

| Feature | Value |
|---|---|
| Networking standards | IEEE 802.1Qau, IEEE 802.3az, IEEE 802.3ad, IEEE 802.1Qbg, IEEE 802.1Qbb, IEEE 802.1Qaz, IEEE 802.1Q, IEEE 802.1AX |

### Performance

| Feature | Value |
|---|---|
| Windows operating systems supported | Y |
| Other operating systems supported | FreeBSD |

### Weight & dimensions

| Feature | Value |
|---|---|
| Height | 69 mm |
| Width | 142 mm |

## FAQ

### How much does the Network Card MCX4121A-ACAT cost, and is it available for purchase?

The price is 145.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 51 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 23.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Cash payment, Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All MELLANOX products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized MELLANOX service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: connectivity technology, interface, host interface, networking standards, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/1020263/64110926_large.webp