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Green PCB network card with silver RJ45 port and full-height metal bracket

SMUGDESK

SMUGDESK RTL8125GB 2.5Gbps PCIe x1 Network Card

SKU CH-7DSB-65Y4S

A 2.5Gbps PCIe x1 network adapter adds 2500Mbps wired Ethernet to a desktop via an RJ45 port using the RTL8125GB chip

  • 5 Gbps wired speed backed by Realtek RTL8125GB chip
  • PCIe x1 slot fits x1 through x16 motherboard slots
  • Works with Cat5e and Cat6 cables for stable links
  • Native driver support on Windows 10, 11, Server and Linux
  • Hardware checksum offload lowers CPU load during heavy transfers

Upgrade to 2.5G wired networking

This SMUGDESK PCIe x1 network card adds a 2.5GBASE-T RJ45 port to a desktop PC using the Realtek RTL8125GB controller. It delivers up to 2500Mbps throughput and auto-negotiates down to 1G, 100M or 10M speeds. The board fits x1, x4, x8 or x16 slots on mainstream motherboards and includes a full-height metal bracket for standard ATX chassis mounting. Native driver support covers Windows 10, Windows 11, Windows Server and Linux.

Slot flexibility and CPU offload

A single PCIe x1 slot is all the card requires, leaving larger slots free for graphics or storage add-in cards. Hardware checksum offload for TCP/IP reduces CPU load during heavy transfers such as large file downloads or NAS access. The standard RJ45 port works with Cat5e or Cat6 copper cabling for stable short-to-medium distance links. No external power connector is needed.

Suited for LAN upgrades.

This adapter suits owners who want faster wired LAN performance for gaming, NAS connectivity or replacing a failed onboard port. It does not serve builds that require fibre SFP connectivity, multiple Ethernet ports, or Wi-Fi capability. Buyers needing 10GBASE-T speeds or server-grade multi-queue features should look at higher-tier controllers.

Highlights

  • 5 Gbps wired speed backed by Realtek RTL8125GB chip
  • PCIe x1 slot fits x1 through x16 motherboard slots
  • Works with Cat5e and Cat6 cables for stable links
  • Native driver support on Windows 10, 11, Server and Linux
  • Hardware checksum offload lowers CPU load during heavy transfers

Specifications

No published specifications for this item yet.

Questions about this item

Will the Realtek RTL8125GB chip sustain 2.5 Gbps throughput without throttling?

The RTL8125GB controller is rated for 2500 Mbps (2.5GBASE-T) and negotiates down to 1G, 100M or 10M when the link partner cannot match the top speed.

How much heat or noise does the card add when running a 2.5 Gbps link all day?

The card is a passive single-port adapter with no fan; it draws power only from the PCIe x1 slot and adds no audible noise during continuous operation.

Which operating systems already include a driver so the card works without extra downloads?

Windows 10, Windows 11, Windows Server and mainstream Linux distributions provide native driver support for the RTL8125GB chipset.

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