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

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

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: Does the Lekuo PR27R11 PCIe 10G network card require a driver?
A: Yes, drivers are required for both Windows and Linux systems. Windows users can download the latest RTL8127 driver from our support page(https://lekuo.com/uploadfile/upload///data/upload/image/RTL8127.zip). Linux users with Kernel 5.9+ have built-in RTL8127 support.

Q: What PCIe slot does the PR27R11 network card use?
A: The Lekuo PR27R11 uses a PCIe Gen4 x1 interface and is backward compatible with PCIe Gen3/Gen2 slots. It can be installed in any x1, x4, x8, or x16 PCIe slot on your motherboard.

Q: What Ethernet cable is required for 10Gbps speeds?
A: For full 10 Gigabit performance, use Cat6A or Cat7 Ethernet cables (up to 100 meters). Cat6 cables support 10Gbps up to 55 meters. Cat5e cables only support 1Gbps maximum.

Q: How much power does the PR27R11 consume?
A: The Lekuo PR27R11 is extremely power-efficient: • 10G mode: 1.79W (typical) • 5G mode: 1.37W • 2.5G mode: 1.21W • 1G mode: 0.92W This is 40% lower than Intel X550-based 10G cards, making it ideal for always-on servers and NAS systems.

Q: Is the PR27R11 compatible with low-profile (SFF) PC cases?
A: Yes! The Lekuo PR27R11 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.

Q: Does the RTL8127 network card support Jumbo Frames?
A: Yes, the PR27R11 supports Jumbo Frames up to 16KB (16,000 bytes). This feature is particularly useful for NAS storage, video editing workflows, and large file transfers, reducing CPU overhead and improving throughput.

Q: Can I use the PR27R11 with a 2.5G or 5G network?
A: Absolutely! The RTL8127 chipset supports multi-gigabit speeds: 10G, 5G, 2.5G, 1G, and 100Mbps. It will auto-negotiate to match your switch/router speed, making it future-proof for network upgrades.

Q: What operating systems are supported?
A: The Lekuo PR27R11 is compatible with: • Windows 10 (64-bit) and Windows 11 • Linux Kernel 2.4.x, 2.6.x, and newer (built-in support in Kernel 5.9+) • VMware ESXi (with community drivers) • Proxmox VE, TrueNAS, Unraid

Q: Why is my 10G network card only showing 1Gbps speed?
A: ✅ Common causes: 1. Check if you're using a Cat6A/Cat7 cable (Cat5e maxes out at 1Gbps) 2. Verify your switch/router supports 10G (most consumer routers are 1G only) 3. Ensure the driver is installed and updated 4. In Windows: Device Manager → Network Adapters → RTL8127 → Properties → Advanced → Speed & Duplex → Set to "10Gbps Full Duplex"

Q: Does the PR27R11 support Wake-On-LAN (WOL)?
A: Yes, the Lekuo PR27R11 fully supports Wake-On-LAN functionality. You can remotely power on your PC/server over the network. Make sure to enable WOL in your BIOS settings and network adapter properties.