Lekuo PCIe4.0 x1 10G Network Card | Realtek RTL8127 | Low Power 1.79W

Product Specifications

Product Description

Driver Download

Document Download

Q&A

Model

PR27R11

Chipset

Realtek RTL8127

Interface

PCIe Gen4 x1

Transfer Rate

10Gbps / 5Gbps / 2.5Gbps / 1Gbps / 100Mbps

Power Consumption (Typical)

10G: 1.79W, 5G: 1.37W, 2.5G: 1.21W, 1G: 0.92W

Supported Standards

IEEE 802.3az, 802.3an, 802.3u, 802.3ab, 802.3bz

VLAN Support

802.1Q VLAN, 802.1ad Double VLAN, 802.1P Priority

PTP

IEEE 1588v1/v2 Precision Time Protocol

Synchronous Ethernet

Supported

Special Features

Wake-On-LAN, PTP IEEE 1588v1/v2, VLAN support, Jumbo Frame 16KB

Operating Temperature

0°C to +70°C

Storage Temperature

-55°C to +125°C

Operating System Support

Windows 10/11, Linux 2.4.x and above

Package Included

1 x PCIe 10GBASE-T Network Card, 1 x Low Profile Bracket, 1 x User Manual

LeKuo PR27R11: PCIe 4.0 x1 Single-Port 10GbE Card

Ultra-Low Power 10G Network Card for Servers and NAS
The Lekuo PR27R11 is an enterprise-grade 10 Gigabit Ethernet network card powered by the Realtek RTL8127 chipset. With ultra-low power consumption of only 1.79W at 10G mode (40% lower than Intel X550-based cards), it is ideal for always-on servers, NAS systems, and energy-efficient data centers.

Multi-Gigabit Speed Support with Auto-Negotiation
The RTL8127 chipset supports true multi-gigabit speeds: 10Gbps, 5Gbps, 2.5Gbps, 1Gbps, and 100Mbps. The network card automatically negotiates to match your switch or router speed, making it future-proof for network upgrades. Whether you have a 10G core switch or a 2.5G home router, this card adapts seamlessly.

PCIe Gen4 x1 Interface - Maximum Compatibility
Utilizes PCIe Gen4 x1 interface with support for up to 16.0 GT/s per lane, providing sufficient bandwidth for 10Gbps networking. Backward compatible with PCIe Gen3 and Gen2 motherboards. Can be installed in any x1, x4, x8, or x16 PCIe slot on your motherboard.

Enterprise-Grade Features
IEEE 1588v1/v2 Precision Time Protocol (PTP) - For time-sensitive applications requiring microsecond-level synchronization
Synchronous Ethernet - Ensures precise timing distribution across networks
Wake-On-LAN - Remotely power on your PC or server over the network
Jumbo Frames up to 16KB - Reduces CPU overhead by 20-30% for large file transfers
VLAN Support (802.1Q, 802.1ad, 802.1P) - For network segmentation and priority tagging
Wake Packet Indication - Enhanced WOL functionality

Low-Profile Design for Compact Cases
Includes a low-profile bracket in the package, making it compatible with small form factor (SFF) PCs, mini-ITX cases, and 1U/2U rackmount servers. The compact design ensures it fits even in space-constrained environments.

Plug-and-Play Driver Support
Fully compatible with Windows 10/11 (64-bit) and Linux Kernel 2.4.x and above. Windows users can download the latest RTL8127 driver from our support page. Linux users with Kernel 5.9+ benefit from built-in RTL8127 support with no additional installation required.

Complete Package Contents
1 × Lekuo PR27R11 PCIe 10G Network Card
1 × Low Profile Bracket (for SFF cases)
1 × User Manual with installation guide

Ideal Use Cases
NAS Storage Systems - High-speed access to Synology, QNAP, TrueNAS, Unraid servers
Enterprise Servers - Low-power 10G networking for data centers and server rooms
Workstation Performance - Accelerate large file transfers for video editing and 3D rendering
Home Lab Virtualization - Dedicated 10G network for Proxmox, ESXi, or Hyper-V hosts
Gaming & Streaming - Ultra-low latency for competitive gaming and live streaming setups
Industrial Automation - IEEE 1588 PTP for time-critical control systems

Why Choose Lekuo PR27R11?
Compared to Intel X550-based 10G cards, the RTL8127 chipset offers 40% lower power consumption while maintaining enterprise-grade performance and features. This makes it perfect for 24/7 operation in always-on servers and NAS systems where energy efficiency matters.

Built for Reliability
72-Hour Continuous Stress Testing before shipment
2-Year Limited Warranty with responsive technical support
Operating Temperature: 0°C to 70°C (32°F to 158°F)
Storage Temperature: -55°C to 125°C (-67°F to 257°F)

Technical Specifications
Model: PR27R11
Chipset: Realtek RTL8127
Interface: PCIe Gen4 x1 (backward compatible with Gen3/Gen2)
Transfer Rates: 10Gbps / 5Gbps / 2.5Gbps / 1Gbps / 100Mbps (auto-negotiation)
Power Consumption: 10G: 1.79W | 5G: 1.37W | 2.5G: 1.21W | 1G: 0.92W | 100M: 0.54W
Supported Standards: IEEE 802.3az, 802.3an, 802.3u, 802.3ab, 802.3bz
VLAN Support: 802.1Q, 802.1ad, 802.1P
PTP: IEEE 1588v1/v2 Precision Time Protocol
Special Features: Wake-On-LAN, Synchronous Ethernet, Jumbo Frame 16KB
Operating Systems: Windows 10/11 (64-bit), Linux Kernel 2.4.x+
Operating Temperature: 0°C to +70°C
Form Factor: Low-profile and standard brackets included

Cable Requirements for Full 10G Performance
For full 10 Gigabit speeds, use Cat6A or Cat7 Ethernet cables (up to 100 meters). Cat6 cables support 10Gbps up to 55 meters. Cat5e cables are limited to 1Gbps maximum. Always use quality shielded cables for best performance and reliability.

Related Downloads

Driver Download

1. PR27R11 pdf

Download

Q What advantages does the Realtek RTL8127 chip in the Lekuo PR27R11 have over older Intel X550 or Aquantia chips?

A Traditional 10G NICs (such as Intel X550/Aquantia AQC107) use older manufacturing processes, generate significant heat, and typically require active cooling fans. The Lekuo PR27R11, equipped with the Realtek RTL8127 chip, benefits from a much more advanced process, fundamentally solving the "overheating" pain point of 10G NICs, delivering more stable operation and lower failure rates.

Q What is the actual power consumption of this NIC? Why is it called a power‑saving marvel for home servers/NAS?

A This NIC delivers outstanding power efficiency: typical consumption is only 1.79W in 10G mode, 1.37W in 5G mode, 1.21W in 2.5G mode, and just 0.92W in 1G mode. Compared to the Intel X550, it reduces energy consumption by nearly 40%. For 24/7 home NAS or soft routers, it not only saves electricity but also enables completely passive fanless (Fanless) silent operation.

Q Why does this 10G NIC only require a PCIe 4.0 x1 slot? Can it fully saturate 10Gbps bandwidth?

A Yes, absolutely. A single PCIe 4.0 x1 lane offers a theoretical bidirectional bandwidth of about 2GB/s (16Gbps), while full‑speed 10GbE requires only about 1.25GB/s (10Gbps). Therefore, the x1 interface design delivers full 10G performance without occupying precious x4 or x8 slots.

Q My older motherboard only has PCIe 3.0 or PCIe 2.0 slots. Can I use this PCIe 4.0 x1 NIC?

A Yes, it works normally. This NIC is fully backward compatible with PCIe Gen3 and Gen2. It can be installed into any physical slot (x1, x4, x8, x16) on your motherboard. However, if plugged into a PCIe 3.0 x1 slot, the theoretical unidirectional bandwidth is about 985MB/s, so you might see a slight reduction in peak speed tests, but daily performance still far exceeds that of 2.5G NICs.

Q Does the RTL8127 chip require driver tinkering in Proxmox VE (PVE) or Unraid virtualization systems?

A Driver installation is required.

Q Does the Lekuo PR27R11 support remote wake‑up? How can it be implemented over a 10G network?

A Yes. This NIC fully integrates Wake‑On‑LAN (WOL) remote wake‑up functionality. Simply enable PCIe Device Wake Up and related options in your motherboard BIOS, and turn on "Allow this device to wake the computer" in the NIC's advanced properties within your operating system. You can then remotely wake your main workstation or storage server at any time by sending a Magic Packet over the LAN.

Q Why does my internal network speed test or Windows network connection show only 1Gbps after installing this 10G NIC?

A This is the most common hardware bottleneck in 10G networking. Please check the following four points in order:
1. Cable grade: 10G networks must use Cat6A (Augmented Category 6) or Cat7 (or above) shielded cables. Standard Cat6 cables cannot maintain 10G beyond 55 meters.
2. Physical port: Confirm that the switch or router port on the other end is a 10G port; if it's only Gigabit, the NIC will auto‑negotiate down.
3. Driver not updated: On Windows, if the official RTL8127 driver is not properly installed, the NIC may run in generic Gigabit mode.
4. Force speed: In Windows Device Manager → right‑click the NIC → Properties → Advanced → set "Speed & Duplex" from Auto‑Negotiation to 10Gbps Full Duplex.

Q What tangible improvements does enabling Jumbo Frames bring to 10G internal network editing and NAS transfers?

A This NIC supports Jumbo Frames of up to 16KB (16,000 bytes). When transferring large files (e.g., 4K/8K video editing, NAS backups), enabling Jumbo Frames on both the NIC and switch expands the standard 1500‑byte packet size, significantly reducing the CPU overhead for packet processing. This not only lowers latency but also helps sustain full throughput.

Q Does this NIC support Xpenology (DSM) or VMware ESXi virtualized systems?

A VMware ESXi: The native ESXi image does not include Realtek drivers, but it can be recognized by injecting community networking drivers.
Xpenology (DSM): It can be driven by selecting the Realtek 10G driver extension package during compilation with mainstream bootloaders (such as ARPL / RR).