RCT ADP-1258H PCI Express 2.5G Ethernet Network Adapter

At a Glance

• Up to 2.5Gbps wired Ethernet connectivity

• PCI Express expansion card for desktop computers

• Realtek RTL8125B network controller

• Single RJ45 Ethernet port

• Backward compatible with 10/100/1000Mbps networks

• Automatic network speed negotiation

• Standard and low-profile mounting brackets included

• Compatible with supported Windows, Windows Server and Linux systems

• Cat5e or higher Ethernet cable required for 2.5Gbps connections

Short Description

Upgrade your wired network performance with the RCT ADP-1258H PCI Express 2.5Gbps Ethernet Network Adapter. Featuring a Realtek RTL8125B chipset, high-speed 2.5 Gigabit Ethernet connectivity and backward compatibility with existing Gigabit networks, this PCIe expansion card provides a practical solution for gaming, streaming, large file transfers and everyday network productivity.

Why Choose This RCT Network Adapter?

Faster 2.5Gbps Wired Networking

Upgrade beyond traditional Gigabit Ethernet with support for wired network speeds of up to 2.5Gbps, ideal for demanding network applications and large file transfers.

Realtek RTL8125B Controller

Built around the Realtek RTL8125B chipset, providing support for 2.5 Gigabit Ethernet and compatible lower-speed Ethernet connections.

Backward Compatible Networking

Supports 10Mbps, 100Mbps and 1000Mbps Ethernet networks with automatic speed negotiation, allowing integration with existing compatible network infrastructure.

Flexible Desktop Installation

Includes standard and low-profile brackets for installation in compatible desktop PCs, workstations, servers and small-form-factor computer cases.

Advanced Ethernet Standards

Supports IEEE 802.3bz for 2.5 Gigabit Ethernet, together with IEEE 802.3az Energy Efficient Ethernet, IEEE 802.3x flow control, IEEE 802.1p and IEEE 802.1Q standards.

Best For

• Upgrading desktop computers from Gigabit to 2.5 Gigabit Ethernet

• PC gaming with a wired network connection

• High-speed local network file transfers

• Streaming and bandwidth-intensive applications

• Compatible workstations and small-form-factor PCs

• Connecting to compatible 2.5Gbps switches and network equipment

• Adding or replacing a wired Ethernet connection

Product Description

Upgrade to Faster 2.5 Gigabit Ethernet

The RCT ADP-1258H PCI Express 2.5G Ethernet Network Adapter is designed to expand the wired networking capabilities of compatible desktop computers, workstations and servers.

Delivering network link speeds of up to 2.5Gbps, the adapter provides increased bandwidth for demanding applications, including gaming, live streaming and transferring large files across a compatible local network.

Powered by the Realtek RTL8125B chipset, the adapter supports 10/100/1000/2500Mbps Ethernet connections with automatic negotiation, making it suitable for both existing Gigabit Ethernet infrastructure and faster 2.5Gbps networks.

Flexible Installation and Compatibility

The adapter installs into a compatible PCI Express expansion slot and provides a single RJ45 Ethernet connection.

Included standard and low-profile brackets allow installation in a range of compatible computer chassis, including small-form-factor systems.

Green LINK and orange ACT LED indicators provide visual network connection and activity feedback.

For full 2.5Gbps connectivity, a Cat5e or higher Ethernet cable and compatible 2.5Gbps network equipment are required.

Windows 10 and later systems may install drivers automatically. Manual driver installation may be required depending on the operating system and configuration.

Key Features

• 2.5Gbps Ethernet: Supports wired network link rates up to 2.5 Gigabits per second

• PCI Express Interface: Adds wired network connectivity through a compatible expansion slot

• Realtek RTL8125B: Dedicated 2.5 Gigabit Ethernet controller

• Single RJ45 Port: Standard wired Ethernet network connection

• Backward Compatibility: Supports 10/100/1000Mbps networks

• Auto-Negotiation: Automatically negotiates compatible network link speeds

• Dual Bracket Support: Standard and low-profile brackets included

• Ethernet Standards: IEEE 802.3, 802.3u, 802.3ab, 802.3bz, 802.3az, 802.3x, 802.1p and 802.1Q

• LED Indicators: Green LINK and orange ACT indicators

• Cable Support: Requires Cat5e or higher for 2.5Gbps connectivity

Specifications

Compatibility

Hardware Compatibility

• Desktop PCs and workstations with a compatible PCI Express expansion slot

• Compatible servers with PCI Express expansion support

• Standard and low-profile computer chassis

• Network switches, routers and equipment supporting compatible Ethernet standards

• Cat5e or higher Ethernet cabling for 2.5Gbps connections

Supported Operating Systems

• Windows 7 / 8 / 8.1 / 10 / 11 (32-bit and 64-bit)

• Windows Server 2008 / 2012

• Linux up to kernel 4.15, as specified by the manufacturer

Important: Achieving a 2.5Gbps network link requires compatible networking equipment and suitable cabling. Actual data transfer speeds depend on the connected network and system configuration.

What's in the Box

• 1 × RCT ADP-1258H PCI Express 2.5G Ethernet Network Adapter

• 1 × Standard mounting bracket

• 1 × Low-profile mounting bracket

• 1 × Driver CD

Warranty

Manufacturer warranty period to be confirmed.

Sustainability

Supports IEEE 802.3az Energy Efficient Ethernet.