Tech Specs

Product Specfications

Mac, Windows, and Linux Logos


Mac Compatibility

  • Mac Pro 14,8 (2023)
  • Mac Pro 7,1 (2019)
  • Mac Pro 5,1
  • macOS® 10.12.6+
  • macOS Ventura compatible

Windows Compatibility

  • Windows computer with available x16 PCIe slot
  • Windows 11 and 10

Linux Compatibility

  • Linux computer with available x16 PCIe slot
  • Linux Kernel 5.4.0+
  • Ubuntu 20.04.1+

Thunderbolt Compatibility

  • Supports USB 3 devices when card is installed in a Thunderbolt to PCIe card expansion system


Part Number

  • USB3C-8PM-E


  • 2-year

Form Factor

  • Full-height PCIe computer card

Bus Interface

  • PCI Express 3.0 x8 electrical, x16 mechanical

Peripherals Supported

  • Industry standard USB 3.2 Gen 1, Gen 2 and 2x2; USB 3.1 Gen 1 and 2; USB 3.0, 2.0 and 1.1
  • Thunderbolt-only peripherals are NOT supported

Bus-Powered Peripherals Supported

  • HD, SSD, SSD RAID, etc.
  • 1.5A per port advertised using USB Type-C Charging
  • 7.5W per port for operation or charging

Cables Supported

  • USB-C (10Gbps)
  • USB4
  • Thunderbolt 3 (<1 meter)
  • Thunderbolt 4


  • 4x ASMedia 3142

USB Standard

  • Complies with OHCI (Open Host Controller Interface), EHCI (Enhanced Host Controller Interface), and xHCI (eXtensible Host Controller Interface) standards


  • USB attached SCSI protocol supported under macOS 10.12+, Windows 11 and 10

Hot Plug

  • Supports hot-pluggable and hot swappable device connection

Boot Support

  • Computers do not support booting from any USB 3 PCIe cards

Operating Temperature

  • 0ºC to 35ºC (32ºF to 95ºF)


  • RoHS 3 (Directive 2015/863)
  • IEC62368-1 and IEC62368-2 Safety

Package Contents

  • Allegro Pro USB-C 8-Port PCIe Card
  • Documentation

Support Links

Support Knowledge Base

Documentation and FAQs

Product Manual

Allegro Pro USB-C 8-Port PCIe Card Manual PDF Download Link

Technical Notes

  • Performance may be limited when the Allegro card is installed in a PCIe 2.0 slot, or in a Thunderbolt expansion system.

Videos & Reviews

Product Videos

Product Reviews

tom’sHARDAWRE Article
Sonnet Builds 8-Port 10Gbps USB-C PCIe Adapter
“Modern motherboards rarely have more than three USB-C ports, and for many creative professionals, three is not enough. To address this issue, Sonnet developed a card with eight 10Gbps USB-C connectors specifically for those who need many Type-C interfaces.”
Read Full Review

Allegro Pro USB-C 8-Port PCIe Card