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Green PCB network card with silver RJ45 port and low-profile metal bracket

Roby Technology Co., Limited

Roby Technology Co., Limited 8139 PCIe LAN Card RJ45 Low Profile telephone accessory

SKU CH-1Q3J-6C3BB

Adds a 10/100/1000Mbps RJ45 network port via PCI Express x1 slot with a low-profile bracket for compact cases

  • Product typeAdapter
  • DetailsPCIe LAN Card
  • Key featuresPCIe Lan Adapter,RJ45,Low Profile
  • Adds a Gigabit Ethernet port via PCIe x1 slot
  • Low-profile bracket fits 2U and small-form-factor cases
  • RTL8111E controller delivers 10/100/1000 Mbps speeds
  • Compatible with Windows 11 down to legacy 98SE systems
  • Works in any PCIe x1, x2, x4, x8 or x16 socket

PCIe Gigabit RJ45 Adapter

This new PCIe LAN card adds a single RJ45 Gigabit Ethernet port through any PCI Express x1, x2, x4, x8 or x16 slot. It uses the RTL8111E controller and includes a low-profile bracket for 2U or small-form-factor chassis. The adapter suits PCs and servers needing a wired network link.

Upgrade from 10/100 Ethernet

The card delivers 1000 Mbps in each direction for a 2000 Mbps aggregate throughput, up to ten times faster than 10/100 Ethernet. The jump is worth it when file transfers, backups or streaming saturate a legacy 100 Mbps link. It fits any PCIe-enabled desktop or server with an open slot.

Sustained Gigabit throughput

The RTL8111E controller maintains line-rate Gigabit speeds under continuous load rather than only in short bursts. Broad OS support from Windows 98SE through Windows 11 ensures driver stability during long transfers. Low-profile brackets keep airflow unobstructed in dense 2U enclosures.

How it compares

Measured against everything we stock in Headsets, Cords & Phone Mounts, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 80% of the 796 comparable items (median $17.99).

Specifications

Product
Brand nameRobyTech
Model name8139
Part numberPCIE Ethernet Adapter
Product typeAdapter

Questions about this item

Will the low-profile bracket fit my 2U server case?

The card ships with a low-profile bracket designed for installation in small HTPC cases and 2U servers.

Which PCIe slot do I use and what driver step is often missed?

Insert the card into any PCIe x1, x2, x4, x8 or x16 slot; the RTL8111E controller needs its driver installed before the RJ45 link will come up.

When should I plan to replace this RTL8111E-based adapter?

Replace the card if the RJ45 port fails, link negotiation drops below 1000 Mbps, or the RTL8111E controller stops being recognised by the OS.

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