RTL8126 5Gb PCIe NIC 5 Gigabit Network Card Single RJ45 Port PCI Express X1 Ethernet LAN Adapter 5G 2 5G 1G 100Mbps Auto Negotiation For Windows Windows Server Linux Desktop Low Profile

High-Performance 5Gb PCIe 3.0 x1 Multi-Gigabit Network Interface Card (RTL8126)

Upgrade your desktop, workstation, or compact home-lab server with this reliable, high-performance 5GbE PCIe network adapter. Built on the advanced RTL8126 controller, this card delivers blazing-fast, multi-gigabit wired connectivity to eliminate network bottlenecks during large file transfers, virtual machine operation, and high-bandwidth data handling.

Core Technical Features (Bullet Points):

• High-Speed 5GbE Multi-Gigabit Connectivity: Equips your system with a single high-performance RJ45 port featuring multi-speed auto-negotiation across 5G, 2.5G, 1G, and 100Mbps data rates.
• Advanced RTL8126 Controller: Powered by the dedicated RTL8126 controller chip, providing high throughput, excellent thermal efficiency, and rock-solid network stability under heavy data loads.
• PCIe v3.0 x1 Host Interface: Operates via a standard PCI Express 3.0 x1 lane, maximizing data bus efficiency while remaining seamlessly compatible with PCIe x4, x8, and x16 motherboard slots.
• 100-Meter Long Reach on Cat5e: Achieves multi-gigabit link distances of up to 100 meters using your existing standard Cat5e twisted-pair copper cables, saving you the expense of rewiring.
• Full Enterprise Protocol Suite: Rich feature set supporting PXE network boot, DPDK, Wake-on-LAN (WOL), iSCSI, Jumbo Frames, Auto MDIX, IEEE 802.1Q VLAN tagging, and IEEE 802.3x Full Duplex flow control.
• Broad OS & Virtualization Compatibility: Fully validated across Windows (8/10/11), Windows Server (2016/2019/2022), CentOS (7/8/9), Ubuntu (20/22), FreeBSD (13/14), and VMware ESXi 6.
• Ultra-Compact SFF Form Factor: Measures just 2.76" L × 2.17" W, designed specifically for small form factor (SFF) desktops and slim chassis.

Important Hardware Compatibility Notes (Please Read Before Buying):

• Learn more about the Detailed Specifications

  Details

  Standards	IEEE802.3, IEEE802.3u, IEEE802.3ab, IEEE802.3x
  Connectors	1 x RJ45
  Interface	PCI-Express
  Drivers	Windows 8/10/11; Windows Server 2016/2019/2022; CentOS 7/8/9; Ubuntu 20/22; FreeBSD 13/14; VMware ESXi 6
  Wake On LAN	Yes

  Features

  Features	PXE network boot; DPDK; Wake-on-LAN; iSCSI; Jumbo Frames; Auto MDIX; IEEE 802.1Q VLAN tagging; IEEE 802.3x Full Duplex flow control; multi-speed auto-negotiation; low-profile form factor

  Packaging

  Package Contents	Low-profile bracket only

  Disclaimer

  Disclaimer	Does not support FCoE (Fibre Channel over Ethernet).

  Additional Information

  First Listed on Newegg	September 20, 2026