Lekuo PCIe 10G SFP+ Fiber Network Card – Realtek RTL8127ATF, Ultra-Low 1.79W
Upgrade your desktop, workstation, or server to 10 Gigabit fiber networking with the Lekuo PR27F11. Powered by the latest Realtek RTL8127ATF chipset, this PCIe 10G SFP+ network card delivers blazing-fast 10Gbps connectivity at just 1.79W — up to 75% less power than legacy Intel X520 adapters.
Next-Generation Realtek RTL8127ATF Chipset
The RTL8127ATF is Realtek's latest-generation 10G controller, engineered for energy efficiency without sacrificing performance. With native driver support on Windows 10/11 and Linux kernel 2.4+, it is truly plug-and-play — no manual driver installation required on most systems.
Ultra-Low 1.79W Power – Fanless Silent Operation
At only 1.79W under full load, the PR27F11 generates minimal heat and requires no active cooling fan. This passive fanless design ensures completely silent operation — ideal for home servers, NAS enclosures, and noise-sensitive environments running 24/7.
Broad SFP+ Module Compatibility
The SFP+ port supports a wide range of optical modules and cables: SR multimode (up to 300m), LR single-mode (up to 10km), ER single-mode (up to 40km), and DAC direct-attach copper cables. Dual-rate support means it also works at 1Gbps (1000BASE-X) for seamless integration into existing Gigabit networks.
PCIe x4 Interface – Fits Any Slot
The PR27F11 uses a PCIe 3.0 x4 interface (x2 bandwidth utilized) and is fully backward compatible with PCIe x4, x8, and x16 slots. Whether your system has a dedicated x4 slot or only larger x16 slots, this card installs and works without any issues.
Compact Half-Height Low-Profile Design
With a PCB measuring just 80×45mm, the PR27F11 is one of the most compact 10G NICs available. The included half-height low-profile bracket makes it compatible with 1U rackmount servers, Mini-ITX small form factor cases, and slim desktop enclosures where space is at a premium.
Perfect for 10G Soft Routers and All-Flash NAS
The combination of ultra-low power, passive cooling, and rock-solid driver support makes the PR27F11 the ideal 10G NIC for DIY soft routers (pfSense, OPNsense, iKuai) and all-flash NAS builds (TrueNAS, Unraid, Synology DSM). Devices running 24/7 benefit from lower heat output, slower component aging, and longer service life.
Wide OS Compatibility – Windows, Linux, FreeBSD
The PR27F11 is compatible with Windows 10, Windows 11, Windows Server 2016/2019/2022, Linux (kernel 2.4+), and FreeBSD/TrueNAS. Plug it in and your OS will recognize it automatically. For systems that require manual installation, the driver is available for download directly on this page.
Technical Specifications
| Model |
PR27F11 |
| Chipset |
Realtek RTL8127ATF |
| Interface |
PCIe 3.0 x4 (x2 bandwidth) |
| Network Port |
1 × SFP+ (10GBASE-R / 1000BASE-X) |
| Speed |
10Gbps / 1Gbps dual-rate |
| Power Consumption |
1.79W (typical) |
| Cooling |
Passive fanless |
| PCB Size |
80 × 45mm |
| Bracket |
Half-height low-profile included |
| OS Support |
Windows 10/11, Windows Server, Linux (kernel 2.4+), FreeBSD |
What's in the Box
- 1 × Lekuo PR27F11 PCIe 10G SFP+ Network Card
- 1 × Half-height low-profile bracket
- 1 × User manual
URL:https://lekuo.com/uploadfile/upload//data/upload/image/RTL8127.zip
Q: What chip does this Lekuo 10G NIC use, and what are its core advantages?
A: This NIC features the brand-new Realtek RTL8127ATF chip. Its core advantages are ultra-low power consumption (only 1.79W) and fanless silent design, reducing power usage by up to 75% compared to traditional Intel X520 NICs, making it ideal for 24/7 low-energy operation.
Q: Do I need to manually install drivers when using it under Windows or Linux?
A: The NIC supports native drivers for Windows 10/11 and Linux kernels 2.4 and above. It is plug-and-play on most modern operating systems, with no tedious manual installation required. If your system does not detect the card automatically, please download the driver using the button on this page.
Q: What is the practical significance of 1.79W low power consumption for home servers? Will it generate excessive heat?
A: The ultra-low 1.79W power consumption means extremely low heat generation. Thanks to this, the NIC uses a pure passive fanless cooling design, operating completely silently and effectively avoiding throttling or crashes in small hosts or NAS devices due to overheating.
Q: My motherboard only has PCIe x16 slots. Can I install this PCIe x4 NIC?
A: Yes. Although the NIC has a PCIe x4 physical interface (with PCIe 3.0 x2 bandwidth), it is fully compatible and can be inserted into PCIe x4, x8, or x16 slots on your motherboard and work normally.
Q: What types of optical modules or cables does this SFP+ port support?
A: The SFP+ port offers broad compatibility, supporting SR multimode modules (up to 300m), LR single-mode modules (up to 10km), ER modules (up to 40km), as well as DAC direct-attach copper cables, allowing flexible choices based on your networking distance.
Q: Does this SFP+ port only support 10G speeds? Can it downshift to 1G Gigabit?
A: This port supports dual-rate switching. It not only supports full 10Gbps (10GBASE-R) speeds but is also backward-compatible with 1Gbps (1000BASE-X) Gigabit, allowing integration into existing Gigabit network environments.
Q: What are the dimensions of this NIC? Can it fit into a rackmount server or a mini-ITX case?
A: Its PCB is very compact at just 80x45mm. The slim half-height low-profile design makes it suitable not only for standard cases but also for space-constrained Mini-ITX small-form-factor cases, 1U rackmount servers, and various thin IT devices.
Q: Compared to commonly available used Intel X520 NICs, what advantages does the Lekuo RTL8127 offer?
A: The Intel X520 is an older-generation chip with generally higher power consumption (around 5W-7W) and significant heat output, often requiring active fans or strong airflow. In contrast, the Lekuo RTL8127 reduces power to 1.79W (saving up to 75%), not only saving energy but also enabling silent passive cooling, making it better suited for home and noise-sensitive environments.
Q: Is this NIC suitable for 24/7 soft routers or all-flash NAS devices?
A: Absolutely. Devices running 24/7 demand extremely high power efficiency and stability. The RTL8127's low heat output means slower component aging and longer lifespan, and paired with excellent system compatibility, it is the perfect companion for DIY high-performance 10G soft routers and all-flash NAS builds.
