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Green circuit board with silver RJ45 port and gold PCIe fingers, half-height bracket included

RealTek

Realtek RTL8125 2.5Gbps PCIe Network Card with Half-Height Bracket

SKU CH-6EN6-NA6KC

Adds a 2.5 Gbps RJ-45 port via a PCIe x1 slot and includes a half-height bracket for small-form-factor PCs

  • Rated speed100 Mbit/s/1 Gbit/s/2.5 Gbit/s
  • Interface typex1. Compatible with PCI Express x1, x4, x8, x16 slots.
  • Supported standardsIEEE802.1p, 802.1q, 802.2, 802.3ac, 802.3az, 802.3x, 802.3z,
  • Connection types1 x RJ45
  • Indicator lightsLink. Activity. Speed.
  • DriversIncluded
  • Realtek RTL8125 chipset drives up to 2.5 Gbps wired throughput
  • x1 PCI Express interface fits x1, x4, x8 or x16 slots
  • Half-height bracket included for small form factor builds
  • IEEE 802.3az, 802.1q and 802.1p standards supported
  • Single RJ-45 port with link, activity and speed LEDs

2.5Gbps PCIe Network Card

The Realtek RTL8125 adds a single RJ45 port running at 100Mbps, 1Gbps or 2.5Gbps over a PCIe x1 slot that also fits x4, x8 and x16 slots. It targets desktop builders who need wired throughput beyond 1Gbps in small-form-factor chassis where a half-height bracket is required.

Sustained load behaviour

The controller supports IEEE 802.3az Energy Efficient Ethernet and 802.3x flow control, so back-pressure is honoured during prolonged transfers. Link, Activity and Speed LEDs give immediate visual feedback when the line saturates at 2.5Gbps without relying on short-burst benchmarks.

Installation notes

A half-size bracket is included for low-profile cases and the driver package is supplied for plug-and-play setup on common network operating systems. The card occupies one PCIe x1 lane; systems without a free x1-compatible slot cannot use it.

How it compares

Measured against everything we stock in Wi-Fi Cards & USB Adapters, at today’s prices. Recalculated every night.

Price $25.99
Pricier than about 65% of the 1,565 comparable items (median $18.99).

Specifications

Product
Brand nameRealtek
Model nameRTL8125
Performance
Rated speed100 Mbit/s/1 Gbit/s/2.5 Gbit/s
Connectivity
Supported standardsIEEE802.1p, 802.1q, 802.2, 802.3ac, 802.3az, 802.3x, 802.3z, 802.3ad
Ports & slots
Interface typex1. Compatible with PCI Express x1, x4, x8, x16 slots.
Connection types1 x RJ45
Size & build
Product weight3 oz
In the box
In the boxRealtek 8125. Optional Half Size Bracket. Drivers.
More details
Indicator lightsLink. Activity. Speed.
DriversIncluded

Questions about this item

How much power does the RTL8125 draw when running at 2.5 Gbps all day?

The card conforms to IEEE 802.3az Energy Efficient Ethernet, so it reduces power during low utilisation and draws only what the PCIe x1 slot supplies.

Which bracket do I need on my low-profile chassis to install this card?

A half-height bracket is included in the package; swap it for the full-height bracket if your case uses standard slots.

Will the RTL8125 negotiate 2.5 Gbps with my older Cat 5e patch panel?

The RJ-45 port supports 100 Mbps, 1 Gbps and 2.5 Gbps; Cat 5e cabling can carry 2.5 Gbps up to 100 metres.

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