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Green PCB with silver bracket, two RJ45 ports, PCIe x1 edge connector

SMUGDESK

SMUGDESK Dual 2.5G RJ45 PCIe x1 Network Card

SKU CH-Y0HX-RAFN0

Adds two 2.5Gbps RJ45 ports via PCIe x1 with Realtek RTL8125BG chip, 9KB Jumbo Frame and Wake-on-LAN for desktop networking upgrades

  • Two 2.5 Gbps ports boost wired throughput
  • Realtek RTL8125BG chip auto-negotiates 2.5G/1G/100M/10M speeds
  • PCIe x1 card fits x1/x4/x8/x16 slots for easy desktop install
  • Hardware checksum offload plus 9 KB Jumbo Frames reduce CPU load
  • Works with Windows 10, 11, Server and mainstream Linux drivers

Dual 2.5G RJ45 PCIe x1 Network Card

The SMUGDESK Dual 2.5G RJ45 PCIe x1 Network Card adds two independent 2.5Gbps Ethernet ports to a desktop PC through a single PCIe x1 slot. It targets users who need faster wired links for NAS access, large file transfers or replacing a failed onboard LAN port without occupying a larger expansion slot.

Practical limits of the PCIe x1 interface

The card uses a PCIe x1 connection that fits x1, x4, x8 or x16 slots, but the single-lane bandwidth caps total throughput below the combined 5Gbps theoretical maximum of both ports running at 2500Mbps simultaneously. Real-world speeds also depend on the switch, cabling quality and system CPU load during heavy traffic.

Realtek RTL8125BG chip with dual RJ45 ports

The Realtek RTL8125BG controller drives two physical RJ45 ports that auto-negotiate 2.5Gbps, 1Gbps, 100Mbps or 10Mbps over Cat5e or Cat6 wiring. This single chip determines whether the card matches a build needing two separate 2.5G links for link aggregation or segregated traffic, versus a single-port alternative.

Highlights

  • Two 2.5 Gbps ports boost wired throughput
  • Realtek RTL8125BG chip auto-negotiates 2.5G/1G/100M/10M speeds
  • PCIe x1 card fits x1/x4/x8/x16 slots for easy desktop install
  • Hardware checksum offload plus 9 KB Jumbo Frames reduce CPU load
  • Works with Windows 10, 11, Server and mainstream Linux drivers

Specifications

No published specifications for this item yet.

Questions about this item

Should I pick the single-port or the dual-port version for link aggregation?

The dual-port model provides two independent 2.5Gbps links so you can aggregate bandwidth or run separate networks without adding another card.

Will I actually see 2500Mbps throughput on a busy desktop?

Each port negotiates up to 2.5Gbps; real-world speed depends on your switch, cabling and workload, but the hardware checksum offload and 9KB Jumbo Frame support keep CPU overhead low.

Does the PCIe x1 slot limit the 2.5Gbps rate on either port?

PCIe x1 Gen 2 supplies roughly 5Gbps total bandwidth, enough for both 2.5Gbps ports to run at line rate simultaneously.

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