PCIe x4 to 4 Ports 2.5 Gigabit Ethernet Card

PCIe x4 to 4 Ports 2.5 Gigabit Ethernet Card


  • The network card has 4 port 2.5 Gigabit with Realtek RTL8125B chip, compatible 1Gbps/100M/10M auto-negotiation, support standard Cat5e or above UTP at distances up to 100m (328 feet).
  • Compatible for PCIe slot X1,X4,X8,X16, default with standard bracket, also include low profile bracket, support multiple installation such as PC, server, workstation, NAS, etc.
  • Support Windows10/8.1/8/7/Server 2012,2008, Linux, freely driver download, CD-ROM, manual, Driver link on the bracket, Realtek official website can download the driver easily.
  • Support PXE, Auto MDIX, IEEE 802.1Q VLAN, IEEE802.3bz(2.5GBASE-T), Full Duplex flow control(IEEE 802.3x), IEEE 802.1P Priority , Jumbo frame 16Kbytes.
  • Select the appropriate brackets according to the chassis size, insert into the PCIe slots, install the driver, connect to the network, the LEDs show the link status and rate.

Product Detail

Product Tags


Technical Specifications
Warranty Information
Part number                                                         STC-PN0018

Warranty                                                              3-years

Connector Plating                                                Gold-plated
Physical Characteristics
Port                                                                      PCIe x4

Color                                                                    Black

Interface                                                               4 Port RJ-45

Packaging Contents
1 x 4-Port 2.5 Gigabit PCIe Ethernet Network Card

1 x User Manual

1 x Low-profile bracket

Single gross weight: 0.62 kg    

Driver Download: https://www.realtek.com/zh-tw/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-pci-express-software

Products Descriptions

4 Port 2.5Gb PCIe Network Card, 4 Port 2.5 Gigabit Ethernet Interface Adapter, with Realtek RTL8125B, Support NAS/PC, 2.5G NIC Compliant Windows/Linux/MAC OS.



PCIe x4 to 4 Ports 2.5 Gigabit Ethernet Card, 4 Ports 2.5G PCIe Network Adapter, RTL8125B LAN Controller, 2500/1000/100Mbps RJ45 Ethernet NIC Card, Support PXE for Windows/Linux.


This card is is a high-performance 4-port 2.5G network adapter, supporting 4 network speeds: 2.5GBASE-T/1GBASE-T/100MBASE-T/10BASE-T. With a PCI-E Gen2.1 x1 network adapter easily handles the 2.5GbE line-rate performance.


Lightning-fast 2.5G Networking

Compliant with the 2.5GBASE-T specification and the IEEE802.3bz standard, upgrade up to 2.5X-faster data-transfer speeds for bandwidth-demanding task.

Compatibility 4 Speed

Support 4 network speeds: 2.5GBASE-T/1GBASE-T/100MBASE-T/10BASE-T, for seamless backward compatibility.

Major OS Support

With Realtek Based Chipset, It can be apply in most network operating systems, such as Windows, Linux, MacOS, etc.

Easy to Migration

Easily upgrade to 2.5Gbps networking using standard copper network cables, avoiding the need to install costly optical fiber cables.

Flexible Low Profile Bracket

In addition to the standard bracket, a low-profile/half-height profile bracket for flexible installation in a wide range of computer, workstations.

Flexible Deployment

Supports PCI Express Gen2.1 ×4 interface, for most computers and workstation motherboards.

QoS for Bandwith Priority

Built-in Quality-of-Service (QoS) technology, lets you prioritize gaming experience for a smooth connection experience.

Advanced Features

Supports QoS, VLAN, PXE, Teaming , AFT, SFT, ALB for improved network performance, efficiency, reliability and security.



Supports 2.5G Lite (1G data rate) mode

Supports PCI Express 2.1

Supports 4 high performance 2.5-Gigabit LAN ports

Auto-Negotiation with Extended Next Page capability (XNP)

Compatible with NBASE-TTM Alliance PHY Specification

Supports pair swap/polarity/skew correction

Crossover Detection & Auto-Correction

Supports hardware ECC (Error Correction Code) function

Supports hardware CRC (Cyclic Redundancy Check) function

Transmit/Receive on-chip buffer support

Supports PCI MSI (Message Signaled Interrupt) and MSI-X

Supports power down/link down power saving/PHY disable mode

Supports ECMA-393 ProxZzzy Standard for sleeping hosts

Supports LTR (Latency Tolerance Reporting)

Supports PCIe L1 substate L1.1and L1.2

Compatible with IEEE 802.3, IEEE 802.3u, IEEE 802.3ab

Supports IEEE 1588v1, IEEE 1588v2, IEEE 802.1AS time synchronization

Supports IEEE 802.1Qav credit-based shaper algorithm

Supports IEEE 802.1P Layer 2 Priority Encoding

Supports IEEE 802.1Q VLAN tagging

Supports IEEE 802.1ad Double VLAN

Supports IEEE 802.3az (Energy Efficient Ethernet)

Supports IEEE 802.3bz (2.5GBase-T)

Supports Full Duplex flow control (IEEE 802.3x)

Supports jumbo frame to 16K byte

Supports standard and low profile chassis


System Requirements 

Windows OS

Linux, MAC OS and DOS

PCI Express-enabled system with an available PCI Express slot


Package Contents

1 x 4 Ports 2.5G PCIe Network Adapter

1 x User Manual

1 x Low-profile bracket  



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