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Green PCB network card with two silver RJ45 ports and PCIe x1 edge connector

SMUGDESK

SMUGDESK Dual-Port 2.5G PCIe x1 Ethernet NIC Realtek RTL8125BG

SKU CH-MNX0-D8TYA

Adds two independent 2.5G Ethernet ports via a PCIe x1 slot using the Realtek RTL8125BG controller for 2500Mbps wired networking on desktop PCs

  • Two independent 2.5G Ethernet ports for high-speed wired links
  • Realtek RTL8125BG controller drives 2500Mbps on each RJ45 connector
  • PCIe x1 interface fits x1, x4, x8 or x16 slots on ATX desktops
  • Hardware checksum offload and 9KB Jumbo Frames cut CPU load during large transfers
  • Works with Windows 10, 11, Server and mainstream Linux kernels

Dual 2.5G ports for desktop PCs

This SMUGDESK PCIe x1 network card adds two independent 2500Mbps RJ45 connections to a desktop computer. It targets home and small-office users who need faster wired links for NAS access, link aggregation or replacing a failed onboard port. The Realtek RTL8125BG controller handles 2.5G, 1G, 100M and 10M auto-negotiation over Cat5e or Cat6 cabling.

Sustained throughput with CPU offload

Hardware TCP and UDP checksum offload moves packet processing off the host processor during large file transfers. Support for 9KB Jumbo Frames reduces per-packet overhead on continuous bulk-data streams. Each port maintains its own link so heavy traffic on one connection does not stall the other.

PCIe x1 slot requirement

The card installs in any PCIe x1, x4, x8 or x16 slot on a regular ATX desktop chassis. Systems without a free PCIe slot cannot use this adapter. Native driver support covers Windows 10, Windows 11, Windows Server and mainstream Linux distributions.

Highlights

  • Two independent 2.5G Ethernet ports for high-speed wired links
  • Realtek RTL8125BG controller drives 2500Mbps on each RJ45 connector
  • PCIe x1 interface fits x1, x4, x8 or x16 slots on ATX desktops
  • Hardware checksum offload and 9KB Jumbo Frames cut CPU load during large transfers
  • Works with Windows 10, 11, Server and mainstream Linux kernels

Specifications

No published specifications for this item yet.

Questions about this item

How much power does the Realtek RTL8125BG controller draw when both 2.5G ports run at full speed all day?

The card uses the PCIe x1 slot for power; Realtek RTL8125BG is a low-power controller designed for desktop workloads.

Which slot type and operating system do I need so the dual-port 2.5G NIC works without extra drivers?

Any PCIe x1, x4, x8 or x16 slot works; Windows 10, Windows 11, Windows Server and mainstream Linux kernels include native driver support.

Will the 2.5G ports negotiate down to 1G or 100M when connected to my older Cat5e switch and router?

Yes, each RJ45 port auto-negotiates 2.5G, 1G, 100M or 10M and is compatible with Cat5e and Cat6 cables.

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