USB4 to 10G SFP+ Network Adapter — Key Highlights
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USB4 & Thunderbolt Compatible: Supports USB4 40Gbps, fully backward compatible with Thunderbolt 3, 4, and 5. Plug and play — no driver installation required on supported systems.
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Realtek RTL8127ATF Chipset: Industry-proven 10 Gigabit Ethernet chipset delivering stable, low-latency 10Gbps network performance.
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10GbE SFP+ Port: Single SFP+ port supporting 10GBASE-R and 1000BASE-X for long-distance, interference-free fiber connectivity.
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Real-World Speed ~1.15 GB/s: Tested LAN transfer speed ideal for large file transfers, 4K/8K video editing, and real-time collaboration.
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Fanless Aluminum Design: Full aluminum alloy chassis with passive cooling — silent, durable, and only 2.5W power draw.
OS Compatibility
The Lekuo DTB3F11 USB4 to 10GbE adapter works seamlessly with Windows 11 and Windows 10, as well as Linux Kernel 2.4.x and above. Note: macOS is not currently supported.
Who Is the DTB3F11 For?
This USB4 10G fiber network adapter is built for professionals who demand maximum throughput and reliability:
- 📁 NAS & Private Cloud — High-speed access to network-attached storage over fiber
- 🎥 4K/8K Media Production — Smooth streaming and editing of high-resolution footage
- ☁ Virtualization & Cloud Infrastructure — High-throughput data exchange for VM environments
- 💹 High-Frequency Trading — Ultra-low latency for time-sensitive financial systems
- 🔬 Scientific Computing & Data Centers — Meets demanding bandwidth requirements
Technical Specifications
| Item |
Specification |
| Model |
DTB3F11 |
| Host Interface |
USB4 40Gbps (Thunderbolt 3/4/5 compatible) |
| Network Port |
1 x SFP+ 10GbE |
| Chipset |
Realtek RTL8127ATF |
| Supported Speed |
10GBASE-R / 1000BASE-X |
| Power Consumption |
2.5W (ultra-low, fanless) |
| Jumbo Frame |
Up to 16KB |
| Duplex |
Full Duplex |
| Tested LAN Speed |
~1.15 GB/s |
Package Contents
- 📦 1x Lekuo DTB3F11 USB4 to 10G SFP+ Network Adapter
- 🔌 1x Type-C 40Gbps Data Cable
- 📄 1x User Manual
About Lekuo
Founded in 2004, Lekuo (Shenzhen Lekuo Multimedia Co., Ltd.) is a specialist in computer expansion cards and industrial embedded systems. Lekuo products are trusted across manufacturing, aerospace, banking, automotive electronics, medical, and cloud storage industries worldwide.
URL:https://lekuo.com/uploadfile/upload//data/upload/image/RTL8127.zip
Q: Does this network adapter support Apple Mac devices (e.g., MacBook Pro M2/M3)?
A: Mac users should purchase with caution. Currently, this adapter primarily offers native support for Windows 10/11 and Linux (Kernel 2.4.x and above). Since macOS does not currently have official drivers for the Realtek RTL8127 chipset, using it on a Mac may require waiting for future official updates or finding third-party compatibility solutions. It is not recommended as a primary choice for Mac users at this stage.
Q: Can I plug it into a standard USB 3.0 or USB-C 3.2 port? What speed can it reach?
A: No, it will not work. Because 10G network transmission requires immense bandwidth, this adapter relies on the PCIe tunneling protocol. It must be connected to a Type-C port that supports USB4 or Thunderbolt 3/4/5 to function properly. Standard USB-C ports (such as those only supporting USB 3.2 Gen1/Gen2) will fail to recognize or drive the device.
Q: Do I need to manually install drivers to use it?
A: On newer versions of Windows 11 and mainstream Linux distributions, it is usually plug-and-play. If the system does not automatically recognize the device, you can download and install the driver provided on the product page to enable normal operation.
Q: Traditional 10G network cards usually generate a lot of heat. Will this fanless design get hot to the touch?
A: This is one of the key advantages of this product. It uses Realtek's latest low-power chip, the Realtek RTL8127ATF, with a typical power consumption of only 2.5W. Combined with a full aluminum alloy chassis for passive cooling, the device will feel warm to the touch under long-term full load, while remaining completely silent.
Q: Does this SFP+ port support 10G copper modules (RJ45 modules)?
A: Using 10G RJ45 copper modules is not recommended. A 10G RJ45 copper module itself typically consumes 2.5W–3W of power, which exceeds the ultra-low 2.5W design limit of this adapter. This can lead to a sharp increase in heat generation and potential disconnections due to insufficient power. It is highly recommended to use 10G optical transceivers (pure fiber) or DAC 10G direct attach copper cables instead.
Q: What is the actual real-world throughput when fully loaded? How is the latency?
A: In local network testing (such as connecting to a NAS or server), the actual file transfer speed stabilizes around 1.15 GB/s, effectively maxing out the 10Gbps bandwidth. Thanks to the high bandwidth of USB4 and the hardware optimization of the RTL8127, it delivers excellent low-latency performance, making it ideal for latency-sensitive virtualization and heavy data transfer scenarios.
Q: Does it support Jumbo Frames? What is the maximum size?
A: Yes, it does. To further reduce CPU utilization and improve throughput when transferring large files over a 10G LAN, this adapter supports Jumbo Frames up to 16KB. You can adjust this setting in the Windows Device Manager or Linux network configurations.
Q: Does this network adapter require an external power supply?
A: No, it does not. The adapter is bus-powered, drawing its power directly from your computer via the USB4/Thunderbolt interface. Because its own power consumption is extremely low (2.5W), any standard USB4 or Thunderbolt port provides more than enough power.
Q: Does the package include a connection cable? What are the requirements for the cable?
A: Yes, the package includes a 40Gbps Type-C data cable. If you need to replace it with a longer cable, make sure to purchase a USB4 (40Gbps) or Thunderbolt 4/5 data cable. Using standard charging cables or lower-spec USB 3.2 cables may prevent the adapter from achieving its full 10G performance.
Q: Does this USB network adapter support PXE Network Boot (diskless boot) or Wake-on-LAN (WOL)?
A: The adapter supports PXE boot and certain network management features at both the hardware and driver levels. However, whether you can successfully use PXE boot also depends on whether your motherboard's BIOS/UEFI allows network booting via an external USB4/Thunderbolt controller.
