Twin25G T5 Thunderbolt 5 Adapter Support Library

Description: This is the unified Windows driver for the Sonnet TWIN25G and TWIN10G SFP28 Thunderbolt Adapters, and TWIN25G and TWIN10G SFP28 PCIe Cards. Download the latest WinOF-2 drivers.

Description: This is the application (Sonnet Network) that installs the driver to enable the use of Sonnet TWIN25G and TWIN10G SFP28 PCIe cards and Thunderbolt Adapters with Mac computers running macOS 15, 26 and 27

• This application must be installed into your computer’s Applications folder to run. Do not delete the application after installation; doing so will delete the Sonnet driver.

Description: This is the user’s guide for the Sonnet Twin25G T5 Thunderbolt 5 to 25Gb Ethernet adapter. This is revision C of this document.

When operating on battery power and the battery level drops below ~20% on a MacBook Pro or MacBook Air, macOS will decrease 10/25G Ethernet transmit performance in order to conserve battery life for the laptop. This also occurs when macOS Low Power Mode is active.

Windows Server 2026 has native support for Teaming, but Windows 11 needs to be custom configured. The TWIN25G/10G SFP28 can be configured for Teaming under Windows 11 with the NVIDIA command line tool, mlx5muxtool.exe, which is included with the driver download. Sonnet does not support this tool.

The TWIN25G driver kit extension will not show in System Information>Software>Extensions.

To check whether the driver is installed, go to System Information>Hardware>Ethernet Cards. Click on one of the TWIN25G's ports and it should say Driver: com.sonnettech.sntmlx5e.