2.5G PCIe Network Card RTL8125 RJ45 Ethernet Adapter Single Port
2.5G PCIe Network Card RTL8125 RJ45 Ethernet Adapter Single Port
2.5G PCIe Gigabit Network Card – RTL8125 Chip, Single RJ45 Port
Upgrade your server or home lab with the OULLX 2.5G PCIe Gigabit Network Card, powered by the reliable Realtek RTL8125 chip. This internal PCI Express adapter delivers blazing-fast 2.5Gbps wired connectivity through a single RJ45 port, making it an ideal upgrade for virtualization environments, NAS builds, and software-defined routers.
Made in Mainland China.
Key Features
- RTL8125 Chipset – Proven, high-performance Realtek controller for stable 2.5G Ethernet throughput
- PCIe Interface – Standard PCI Express slot for easy installation in desktops and server boards
- Single RJ45 Port – Supports up to 2500 Mbps wired transmission speed
- Built-in Heat Dissipation – Integrated thermal management keeps the card running cool under load
- Broad OS Compatibility – Works across a wide range of hypervisor and NAS operating systems (see compatibility notes below)
- Driver-Free on Windows – Plug and play on Windows; Linux requires driver installation
Compatibility & Driver Guide
- Windows: No driver required — plug and play
- Linux: Driver installation required
- ESXI: Supported on ESXI 6.7U3 only; ESXI 7.0 requires a new driver — does not support ESXI 7.0 out of the box
- PVE (Proxmox): PVE 7.0 comes with driver included; PVE 5 & 6 require manual driver installation
- iKuai: No driver required; some older versions may not be supported
- OpenWrt: No driver required; older versions may need a system update to the latest release
- Unraid: Supported — driver installation may be required depending on version
- Black Synology (DSM): Supports models 918 & 3615; DSM 6.2+ requires integrated driver guidance; DSM 7+ requires new driver installation
- TrueNAS / FreeNAS: Driver required; versions 11 and 12 are supported
Specifications
| Chipset | Realtek RTL8125 |
| Interface | PCI Express (PCIe) |
| Port | Single RJ45 |
| Transmission Rate | Up to 2.5 Gbps (2500 Mbps) |
| Network Type | Gigabit Ethernet (Wired) |
| Heat Dissipation | Supported |
| Wireless | Not supported |
| Bluetooth | Not supported |
| Application | Server / Home Lab / NAS / Virtual Machines |
| Origin | Mainland China |
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Frequently Asked Questions
Q: Does this 2.5G PCIe network card work with ESXI 7.0?
A: No. The RTL8125-based network card supports ESXI 6.7U3 with the available driver. ESXI 7.0 has an integrated driver system that requires a new, separate driver — it is not supported out of the box with this card.
Q: Do I need to install a driver for Windows?
A: No driver installation is needed for Windows — the card is plug-and-play. However, Linux-based systems (including PVE 5/6, TrueNAS, and Synology DSM) will require manual driver installation.
Q: What PCIe slot does this network card require?
A: This card uses a standard PCI Express (PCIe) slot, which is found on most modern desktop motherboards and server boards. It is an internal wired adapter with a single RJ45 port.
Q: Can I use this card with Unraid or OpenWrt?
A: Yes. Unraid is supported (driver may be required depending on your version). OpenWrt is also supported without a driver on current versions — older OpenWrt builds may need a system update first.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.