Can a unifi SFP cable be connected to this card directly?

If you mean the copper SFP28 DAC cable, then yes. I am currently using that. For a fiber cable, you need a transceiver.

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?

This NIC uses SFP28 adaptor. If you use SFP+ transceiver with 10G base-T, you will get 10G speed

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

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

Product ID: 83883544

Details

Brand
Mellanox
Color
Assorted
Compatible Devices
Desktop
Data Link Protocol
Ethernet
Data Transfer Rate
25600 Megabits
Global Trade Identification Number

⚡25.6 Gbps ultra-high throughput

🖧PCIe x8 interface for seamless integration

🖥️Open Compute Project form factor for modern data centers

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Elevate your data center game with Mellanox ConnectX-4 Lx EN — where speed meets smart innovation!

MULTI HOST MAGIC - Revolutionize your rack design with multi-host tech that maximizes ROI by slashing CAPEX and OPEX.
PLUG PLAY SIMPLICITY - Effortless installation with automatic OS recognition—get up and running faster than ever.
BLAZING 25 6 GBPS SPEED - Experience lightning-fast data transfer that keeps your virtual machines and storage humming without a hitch.
UNIVERSAL COMPATIBILITY - Smart interconnect works flawlessly across x86, Power, ARM, and GPU platforms—future-proof your infrastructure.
VIRTUALIZATION POWERHOUSE - Optimized for virtualized overlay networks, enabling more VMs per server with ultra-low latency.

The Mellanox ConnectX-4 Lx EN Network Adapter (MCX4121A-ACAT) delivers industry-leading 25.6 Gbps Ethernet throughput with ultra-low latency, designed for Open Compute Project 2.0 form factor. Featuring PCIe x8 interface and multi-host technology, it optimizes data center ROI by enabling advanced rack designs and supporting diverse compute platforms including x86, Power, ARM, and GPU. Ideal for virtualized environments, it boosts network performance and maximizes VM density per server.

Specifications

ASIN	B011HVAZ78
Best Sellers Rank	#268 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

Reviews

A**T

27.02.2025

T**R

20.10.2025

S**L

7.03.2021

S**A

6.02.2020

L**S

22.03.2019

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