[SSD Enclosure] Why is my PA40SU unable to reach the theoretical maximum transfer speed of 40Gbps?
To achieve the peak performance of the PA40SU, the entire hardware chain—including the host device, interface, cable, and SSD—must meet the required specifications. If you experience limited speeds, please verify the following factors:
• Host Interface Specification:
Please ensure your computer’s port fully supports USB4 (40Gbps).
Some ports labeled as Thunderbolt™ 4 or USB-C may automatically adjust speeds (e.g., falling back to 10Gbps) depending on the system's PCIe bandwidth allocation when handshaking with different bridge chipsets.
For more information of USB 4 , please refer to USB4 Introduction | Official Support | ASUS Global
• Internal SSD Performance:
The PA40SU supports the M.2 NVMe protocol. Ensure that the installed SSD has a theoretical sequential read speed higher than 3,500 MB/s. Using older specifications M.2 SSDs will limit the speed to the physical capabilities of the drive itself.
• Original High-Speed Cable:
Always use the included USB4 high-speed cable provided with the PA40SU. Standard USB-C charging cables or low-spec data cables do not have the necessary bandwidth to carry 40Gbps data loads.
• System and Drivers:
Ensure your operating system (Windows 11 or the latest macOS) is up to date and that the latest chipset drivers are installed to optimize USB4 resource allocation.
For more PA40SU information, please refer to ProArt PA40SU Prodcut Site.