Network Card Lenovo CARDPOP MercuryA3 RJ45 5C51C94255 – PCIe RJ45 Ethernet adapter

Lenovo CARDPOP MercuryA3 RJ45 is a PCIe network card with a single RJ45 Ethernet port designed to provide wired LAN connectivity for compatible desktop PCs and workstations. The adapter installs into a standard PCIe slot and delivers stable, low-latency network access for data transfer, network printing and internet connectivity in office, home or small server environments.

Advantages

This PCIe RJ45 Ethernet adapter offers a straightforward hardware solution to add or replace wired network connectivity without altering system software setup. The card supports consistent, low-latency packet transmission and a physical RJ45 interface that fits widely used Ethernet cabling and network infrastructure. Its compact single-port design minimizes space usage inside the chassis while maintaining reliable electrical and link-layer compatibility with standard Ethernet switches and routers.

Suitable for

• Adding wired Ethernet to desktops lacking an integrated LAN port
• Replacing a faulty onboard network interface
• Workstations requiring a dedicated wired connection for file transfer or printing
• Small office or home servers that need stable LAN access

Key specifications

• Interface: PCI Express x1 (fits PCIe slots for expansion)
• Network port: 1 × RJ45 Ethernet
• Network type: Wired Ethernet (standard Ethernet physical interface)
• Form factor: Low-profile compatible bracket option (compact card design)
• Power and signalling: Powered and managed via PCIe slot with standard link and activity LEDs on port

How to use

Power off the computer and unplug it from the mains. Open the system chassis and locate an available PCIe slot. Insert the CARDPOP MercuryA3 RJ45 card firmly into the slot and secure the bracket to the chassis with the mounting screw. Close the case and reconnect power. On next boot, allow the operating system to detect the new network adapter and install drivers automatically or manually install vendor-recommended drivers if required. Connect a CAT5e/CAT6 Ethernet cable to the RJ45 port and to your network switch, router or wall jack to establish a wired connection.

Usage recommendations

Use shielded or unshielded twisted-pair cabling that matches your network speed requirements and follow standard grounding and cable management practices. Verify that the PCIe slot you choose provides sufficient physical clearance and electrical lanes for the adapter, and keep drivers updated for optimal compatibility and security.