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Green circuit board with silver RJ45 port and aluminum heatsink, full-height and low-profile brackets included

SMUGDESK

SMUGDESK 2.5GBase-T PCIe x1 Network Card RTL8125B

SKU CH-A7PE-S0RD5

Adds 2.5 Gbps wired networking over a PCIe 2.1 x1 slot using the Realtek RTL8125B controller with auto-negotiation at 2500, 1000 and 100 Mbps, includes full-height and low-profile brackets.

  • 5× faster multi-gig Ethernet over existing Cat5e/Cat6 cables with Realtek RTL8125B controller
  • PCIe 2.1 x1 fits x1/x4/x8/x16 slots; full-height and low-profile brackets included for ATX and SFF builds
  • PXE boot, WoL, 9000-byte jumbo frames, VLAN tagging, QoS and checksum offload reduce CPU load
  • Native driver support for Windows, Linux and macOS; compatible with NAS, soft-routing and virtualisation platforms
  • Passive aluminium heatsink enables stable 24/7 operation with LED link/activity indicator

2.5GBase-T PCIe x1 Network Card

This SMUGDESK adapter adds a single 2.5GbE RJ45 port to a desktop or small-form-factor PC through a PCIe 2.1 x1 slot. It targets home NAS users, gamers and DIY virtualization hosts who need more throughput than onboard gigabit Ethernet provides.

Full-height and low-profile brackets included

The package supplies both brackets so the card fits standard ATX cases and slim SFF chassis without extra purchases. Driver support covers Windows, mainstream Linux distributions and macOS, enabling immediate use with DSM, Unraid, OpenWrt, iKuai and Proxmox platforms.

PCIe 2.1 x1 bus limits maximum throughput

The x1 Gen 2 link caps sustained bandwidth near the controller's 2.5GT/s ceiling, so aggregate traffic cannot exceed that ceiling even though the RJ45 port negotiates 2.5G, 1G or 100Mbps. Existing Cat5e or Cat6 cabling is sufficient; no rewiring is required.

Highlights

  • 5× faster multi-gig Ethernet over existing Cat5e/Cat6 cables with Realtek RTL8125B controller
  • PCIe 2.1 x1 fits x1/x4/x8/x16 slots; full-height and low-profile brackets included for ATX and SFF builds
  • PXE boot, WoL, 9000-byte jumbo frames, VLAN tagging, QoS and checksum offload reduce CPU load
  • Native driver support for Windows, Linux and macOS; compatible with NAS, soft-routing and virtualisation platforms
  • Passive aluminium heatsink enables stable 24/7 operation with LED link/activity indicator

Specifications

No published specifications for this item yet.

Questions about this item

Does the RTL8125B controller require any firmware updates or driver maintenance over time?

Native driver support for Windows, Linux and macOS means updates arrive through normal OS channels; the passive aluminium heatsink has no moving parts to service.

What throughput ceiling appears first when the card runs at 2.5 Gbps continuously?

The PCIe 2.1 x1 bus provides 2.5 GT/s bandwidth, which matches the 2500 Mbps line rate so the slot becomes the limiting factor.

How much heat and noise does the card produce during 24/7 operation?

A compact passive aluminium heatsink dissipates heat silently with no fan, enabling stable continuous use without added noise.

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