USB4 to Dual 10G SFP+ Network Adapter,Realtek RTL8127ATF

About this product

• 1.79W（Chip） at 10G — ultra-low power, fully fanless, silent 24/7 operation The entire NIC draws only 7.4W at full load, with controllable heat and steady performance • Realtek RTL8127ATF | USB4 40Gbps host | SFP+ fiber and DAC support • Works with Windows 10/11, Linux, Mac OS（Third-Party Open-Source Driver），TrueNAS, Proxmox, and VMware ESXi LeKuo DTB3F11 vs DTB3F22: Single or Dual Port USB4 10G?

Q&A Q: Does this network adapter use a USB4 interface or a Thunderbolt interface? What is the maximum speed? A: This adapter uses a USB4 interface and is fully backward compatible with Thunderbolt 3 and Thunderbolt 4 interfaces. It is equipped with two 10G SFP+ optical ports, and with both ports working simultaneously it delivers up to 20GbE of network throughput — ideal for high-speed data transfer. Q: Is this USB4 to 10G SFP+ NIC driver-free? A: No. This NIC requires a driver to be installed before it can work properly. It is built on the RTL8127 chipset, so before connecting it to a computer or NAS, be sure to download and install the corresponding RTL8127 driver from the official page. Q: Which operating systems does this adapter support? Can it be used on a Mac or a Synology NAS? A: Official specifications state support for Windows and Linux (native support for Linux kernel 5.x+). macOS is supported, but there is currently no official macOS driver for the Realtek RTL8127 chipset. That said, third-party open-source drivers are already available for this chip family. Project and download: https://github.com/stefb69/RTL812xLucy/releases. These drivers are released as open source by a third-party developer under the GPLv2 license, and LEKUO was not involved in their development. Some releases are still marked as beta, and compatibility and stability may change as macOS versions are updated — please refer to the latest release notes on the project page for the most current information. If you plan to use it on a specific closed-source NAS system (such as Synology), we recommend confirming in advance whether a third-party community driver is available for the Realtek RTL8127 chipset. Q: What types of SFP+ optical modules can it work with? What distances does it support? A: This adapter offers excellent compatibility, supporting 10G SR (short-reach multimode, 850nm wavelength, transmission distance up to 300 m) and 10G LR (long-reach single-mode, 1310nm wavelength, transmission distance up to 10 km) SFP+ optical modules. Q: Does running dual-port 10GbE generate a lot of heat? What is its actual power consumption? Does it need an external power supply? A: This adapter uses an ultra-efficient single-chip design, drawing only 2.5W in 10GBASE-R mode (ultra-low power consumption), with a maximum of just 7.4W even when the entire NIC runs at full load. It is powered entirely through the USB4/Thunderbolt bus (bus-powered) and does not require an external power supply. Its enclosure uses all-aluminum finned passive cooling to ensure stable long-term operation. Q: Who is this external 10G NIC suitable for, and in what application scenarios? A: It is ideal for network engineers, content creators working in film and video post-production, and IT professionals, as well as users with a Mini PC or laptop, or those who cannot easily open their machine to add a PCIe expansion card. Without opening the chassis, it provides enterprise-grade 10GbE fiber connectivity for virtualization environments, high-speed storage, and large data transfers. Q: Can the two SFP+ ports be configured independently? Does it support link aggregation? A: Yes. The two 10G SFP+ ports are independent of each other and can be connected to different LANs, switches, or servers. Because the system recognizes them as separate network interfaces, you can configure Link Aggregation (Bonding / Teaming) through Windows/Linux system software or your switch to achieve bandwidth aggregation or network redundancy and failover. Q: What is included in the box? Can I use an ordinary phone USB-C charging cable to connect it? A: The package includes 1× adapter unit, 1× dedicated USB4 cable, and 1× Quick Start Guide. We strongly recommend using the included cable or a certified USB4 / Thunderbolt 4 cable. Ordinary low-cost USB-C charging cables or USB 3.0 cables will not be recognized and cannot provide the 40Gbps bandwidth required by a 10GbE NIC. Q: Can it be used under virtual machine systems such as PVE (Proxmox VE) or ESXi? A: This product is supported through Linux drivers (native support for Linux 5.x+ kernels). Under PVE (based on Debian Linux), as long as the kernel version includes the driver for the RTL8127 chipset or you compile it manually, the adapter can be recognized and used for VM network bridging. ESXi users will need to check whether the community has released a corresponding Realtek driver patch. Q: Compared with an ordinary copper (RJ45) 10GbE NIC, what advantages does this SFP+ fiber NIC offer? A: Compared with traditional RJ45 10GbE copper ports, SFP+ fiber connections deliver lower latency, significantly reduced power consumption (as low as 2.5W), and minimal heat buildup, and are completely immune to electromagnetic interference (EMI). Combined with its low-power design, network performance stays more stable and maintains full speed during sustained large-file transfers or concurrent multi-task workloads — unlike copper ports.