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Green circuit board with silver RJ45 port and gold PCIe fingers, silver heatsink on black chip, low-profile bracket included

GigaPlus 2.5Gbps PCIe Network Card RTL8125B

SKU CH-2Q0S-BWQJZ

Adds a 2.5 Gbps Ethernet port through a PCIe slot using a Realtek RTL8125B controller with backward compatibility and a low-profile bracket included

  • Rated speed2,500 Mbit/s
  • Supported standardsEthernet
  • Connection typesEthernet, 2,500 Mbit/s
  • Wireless speed2.5G RTL8125B
  • Bluetooth supportEthernet
  • Bus interfacePci express x4
  • 5 Gbps Ethernet throughput for faster large-file transfers and smoother streaming
  • Backward compatible with 1 Gbps and 100 Mbps networks so existing cabling works
  • Fits PCIe x1, x4, x8 or x16 slots for flexible desktop installation
  • Realtek RTL8125B controller with driver-free setup on Windows 10 and 11
  • Included low-profile bracket enables use in small-form-factor cases

2.5 Gbps PCIe Network Card

The GigaPlus 2.5G NIC uses a Realtek RTL8125B controller to add a single 2.5GbE RJ45 port through a PCIe x4 slot. It targets desktop, workstation or server builders who need faster wired throughput than standard Gigabit without moving to 10 GbE infrastructure.

Backward-compatible 2.5G/1G/100 Mbps operation

The adapter negotiates 2.5 Gbps, 1 Gbps or 100 Mbps links automatically, so it works with existing switches and routers. Driver support covers Windows 7 through 11, Windows Server, Linux and macOS; Windows 10 installs without a separate download, while other systems pull the driver from the Realtek site.

Low-profile and standard brackets included

A heatsink covers the controller for passive cooling during sustained transfers. Thickened gold fingers improve conductivity and oxidation resistance. Both full-height and low-profile brackets ship in the box, letting the card fit full-size towers, mini-towers or compact server chassis.

How it compares

Measured against everything we stock in Ethernet Cards & NICs, at today’s prices. Recalculated every night.

Price $28.99
Cheaper than about 85% of the 1,505 comparable items (median $90.99).

Specifications

Product
Brand nameGigaPlus
Model nameRTL8125B, 2.5G NIC
Part number2.5G NIC
Performance
Rated speed2,500 Mbit/s
Connectivity
Supported standardsEthernet
Wireless speed2.5G RTL8125B
Bluetooth supportEthernet
Ports & slots
Connection typesEthernet, 2,500 Mbit/s
Bus interfacePci express x4
Size & build
Product weight0.12 kg

Questions about this item

Should I pick the GP-2.5G NIC or one of the 10G models like GP-AQC113 or GP-X540?

The GP-2.5G NIC uses the Realtek RTL8125B controller and provides a single 2.5GbE RJ45 port, while the GP-AQC113 and GP-X540 models offer 10GbE speeds with different controllers and port types.

What does the 2500 megabits per second rating actually deliver when the card is installed?

The card negotiates at 2.5Gbps, 1Gbps or 100Mbps depending on the switch or router it connects to, so real-world throughput will match the slowest link in the chain.

The card uses a PCIe x4 interface — does that limit the speed in an x1 slot?

The adapter works in x1, x4, x8 or x16 slots; in an x1 slot the single lane still carries enough bandwidth for the 2.5Gbps Ethernet link.

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