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Single-port 2.5GbE PCIe network card with Realtek RTL8125B
Upgrade a desktop or server to 2.5GbE over standard copper cabling with 2.5G/1G/100M/10M auto-negotiation, 16K jumbo frames, Wake-on-LAN and PXE support.

Key capabilities
Four Ethernet speeds
Supports 2.5Gbps, 1Gbps, 100Mbps and 10Mbps network operation.
Realtek RTL8125B
The current exact StarTech technical specification identifies the controller as RTL8125B.
CAT5e-friendly 2.5GbE
Supports 2.5Gbps networking over suitable CAT5e cabling up to 100m depending on the network configuration.
Advanced NIC features
Supports 16K jumbo frames, Auto-MDIX, Wake-on-LAN, PXE and IEEE 802.1Q VLAN tagging.
What to know before buying
The host requires a PCIe x1 slot. To reach 2.5Gbps, the connected switch/router and cabling must also support 2.5GBASE-T or compatible NBASE-T operation.
Australian version and manufacturer warranty
This item is the Australian version supplied by DeviceDeal and is covered by the official StarTech.com 2-year manufacturer warranty in Australia.
Please retain your DeviceDeal tax invoice as proof of purchase. Warranty coverage and claims are subject to StarTech.com warranty terms, eligibility requirements and product assessment.
Frequently asked questions
What is the fastest network speed supported by ST2GPEX?
What other speeds are supported?
Which chipset does the current exact model use?
What host interface is required?
Does it support jumbo frames?
Does it support Wake-on-LAN and PXE?
Can 2.5GbE run over CAT5e?
What warranty applies in Australia?
(ST2GPEX)
Features and highlights
Four Ethernet speeds
Supports 2.5Gbps, 1Gbps, 100Mbps and 10Mbps network operation.
Realtek RTL8125B
The current exact StarTech technical specification identifies the controller as RTL8125B.
CAT5e-friendly 2.5GbE
Supports 2.5Gbps networking over suitable CAT5e cabling up to 100m depending on the network configuration.
Advanced NIC features
Supports 16K jumbo frames, Auto-MDIX, Wake-on-LAN, PXE and IEEE 802.1Q VLAN tagging.
- 2.5GbE RJ45
- RTL8125B
- 16K jumbo frames
- 2-year warranty
Specifications
Verified specifications for StarTech ST2GPEX.

Warranty Information
| Warranty | 2 Years |
|---|
Hardware
| Ports | 1 |
|---|---|
| Bus Type | PCI Express |
| Host Interface | PCI Express x1 |
| Card Type | Standard profile; low-profile bracket included |
| Chipset ID | Realtek RTL8125B |
Performance
| Compatible Networks | 2.5G / 1G / 100Mbps / 10Mbps |
|---|---|
| Jumbo Frame Support | 16K max. |
| Auto MDIX | Yes |
| Wake On LAN | Yes |
| PXE | Yes |
| VLAN Tagging | IEEE 802.1Q |
Connector(s)
| External Port | 1 × RJ45 |
|---|
In the Box
| Included | Network card; low-profile bracket; quick-start guide |
|---|
| SKU | ST2GPEX |
| Barcode # | 65030882040 |
| Brand | Startech |
| Shipping Weight | 0.1000kg |
| Shipping Width | 0.003m |
| Shipping Height | 0.017m |
| Shipping Length | 0.014m |
StarTech.com warranty in Australia
This item is the Australian version supplied by DeviceDeal and is covered by the official StarTech.com 2-year manufacturer warranty in Australia.
Please retain your DeviceDeal tax invoice as proof of purchase.
Warranty coverage and claims are subject to StarTech.com warranty terms, eligibility requirements and product assessment. This wording does not promise automatic replacement or guaranteed claim approval.
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