• Overview
  • Tech Specs
Computers with Allegro USB-A Pro 4port PCIe Cards

Up to 2 Times the performance USB 3.0 and USB 3.1 Gen 1 Connections

The fastest SSD-based USB 3.1 Gen 2 drives now available can transfer data at 800 MB/s—many are bus-powered, too. But, most desktop computers (including many new models) feature old-generation USB interfaces that can’t support that performance, and may not provide enough power to enable those bus-powered drives to function. Break through the bottleneck—install Sonnet’s Allegro™ Pro USB 3.1 PCIe card in your Mac Pro® tower, Windows® PC, or Linux(1) computer with PCIe slots; or Thunderbolt™ to PCIe card expansion system to support your fast USB drives at maximum performance.

Two Gen 2 Controllers, Four USB-A Ports

Featuring two 10Gbps USB 3.1 Gen 2 controllers and four USB-A ports, the Allegro Pro USB 3.1 PCIe card supports the fastest USB drives available, yet provides the most common connection type for peripheral devices.

Key Features

SuperSpeed+ 10Gbps USB Ports—Adds four 10Gbps USB-A ports to your Mac Pro, Windows PC, or Linux(1) computer with PCIe slots; or Thunderbolt to PCIe card expansion system

Dual USB 3.1 Gen 2 Controllers—Support data transfers at up to twice as fast as USB 3.0 and USB 3.1 Gen 1, and boost data transfer speeds between connected drives

Powered Ports—Supports USB bus-powered SSD, SSD RAID, and hard drive devices with up to 7.5W power per port

Supports Charge & Sync—Supports USB 3.0 charging port handshake, and will simultaneously sync and charge iPads and other devices that support USB 3.0 charging at 1.5A per device

Protected Power Delivery—Independent power regulation isolates each port to prevent cross-coupled power glitches that may cause accidental disconnects; resettable device overcurrent fuses protect the card and computer, and may be reset by a simple shutdown

Optimized for Thunderbolt—Provides maximum performance over Thunderbolt

Easy Installation—Quick and easy user installation into any available PCIe slot

Broad USB Device Support & Compatibility—Supports storage, hubs, and other USB-IF compliant USB devices


The Speed and Power

Connected to a single USB 3.1 Gen 2 SSD RAID device, Sonnet’s Allegro Pro USB 3.1 PCIe card supports data transfers up to 800 MB/s—transfers complete in half the time(2) compared with using a USB 3.1 Gen 1 or USB 3.0 adapter card! Made possible through the use of dual controllers, with two connected drives, each port supports simultaneous 660 MB/s transfers. With four drives connected, each port supports simultaneous 300 MB/s transfers!

The speed and power

Sonnet Port Power Advantages:

Unlike ordinary USB adapter cards, the Allegro Pro USB 3.1 PCIe was designed with a focus on intelligent power management and delivery for powering attached drives through its ports.

No Auxiliary Power Needed

Ordinary USB-A cards require the connection of a separate power connector. The Allegro Pro draws the power it needs from the slot it’s installed in to power connected drives, enabling you to install the card in any compatible computer or Thunderbolt expansion chassis that doesn’t have these power connectors available.

No Aux Power Needed



Independent Power Regulation for Each Port

Ordinary USB-A cards can provide poor power regulation through their ports. The Allegro Pro card protects each port from power glitches on adjacent ports—such as when a hard drive spins up after connection—preventing auto-disconnects of already-connected drives.

Resettable Fuses

Unlike ordinary USB-A cards, the Allegro Pro features a resettable fuse on each port to protect the card and your computer should a cable or peripheral fail. Resetting a tripped fuse is simple— just shut down and restart your computer.

Independent Power Regulation for Each Port


Optimized for Thunderbolt

Got a Thunderbolt connection, but no PCIe slot? The Allegro Pro USB 3.1 PCIe card is ideal for use in Sonnet’s Thunderbolt 2 and Thunderbolt 3 to PCIe card expansion systems, including Echo Express™ and xMac™ desktop and rackmount chassis. Now you can add four SuperSpeed+ USB-A ports to your computer without expansion card slots.

Mac Computers with Echo Express SE III



Perfect for the Extra Slot in Your Multi-Slot Thunderbolt Chassis
Have a multi-slot Thunderbolt 2 or Thunderbolt 3 to PCIe card expansion chassis with an open slot? Installing an Allegro Pro USB 3.1 PCIe card is an excellent way to inexpensively add four 10Gb USB-A ports to your computer.

Easy Installation Broad Device Support

Easy Installation, Broad Device Support

The full-height Allegro Pro USB 3.1 PCIe card installs easily into any PCIe x4 (mechanical) or larger slot. The Sonnet card features hot-pluggable and hot-swappable device connection support with automatic device configuration, and works with all USB-IF compliant USB peripherals.

Easy Installation Broad Device Support

 Computer hardware shown for illustration purposes; items sold separately.

Technical Notes

  1. Linux supports only 5Gb transfer rate as of 4.12.13 Kernel.
  2. Data transfer speeds can be limited by cable type (USB 3.1 Gen 2, USB 3.1 Gen 1/USB 3.0, or USB 2.0), as well as the speeds supported by the device itself.


Part No.  
USB3-PRO-4P10-E Allegro Pro USB 3.1 PCIe
Warranty 2-year
Form Factor PCIe computer card
Bus Interface PCI Express 2.0 x4
Peripherals Supported Industry standard USB 3.1 Gen 2, 3.0, 2.0, and 1.1
Bus Powered Peripherals Supported
  • Up to 7.5W per port for operation or charging
Cables Supported
  • USB-A 10Gbps
  • USB-A 5Gbps
  • USB-A 480Mbps
Chipset 2x ASMedia 1142
RoHS Compliant Yes
Package Contents
  • Allegro Pro USB 3.1 PCIe adapter card
  • Documentation
USB Support  
Standard Complies with OHCI (Open Host Controller Interface), EHCI (Enhanced Host Controller Interface), and xHCI (eXtensible Host Controller Interface) standards
UASP USB attached SCSI protocol supported under
macOS 10.10 & 10.12+, Windows 10
USB Charging USB Battery Charging 1.2 compliant (up to 7.5W per port)
Chipset Throughput 20Gbps combined port throughput
Number of Devices Supported Up to 62
Hot Plug Supports hot-pluggable and hot swappable device connection
Boot Support No computers support booting at this time


Specifications subject to change without notice.

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Mac Compatibility

Mac Pro® 3,1, 4,1 or 5,1

macOS 10.10.5, 10.12.6+(1)
(not compatible with macOS 10.11)

macOS Mojave compatible

Windows Compatibility

Computer with PCIe slots

Windows 10, 8.1, 7

Windows Server 2016, 2012, and 2008 (64-bit editions)

Linux Compatibility(2)

Computer with PCIe slots

Linux 4.12+(1) Kernel (LTS version only)

Thunderbolt Compatibility

Supports USB 3 peripherals on a Mac or Windows PC when installed in a Thunderbolt 2 or Thunderbolt 3 PCIe expansion system(3)

macOS 10.12.6+(1)

Windows 10 Build 1709 or newer (64-bit edition)

Technical Notes

  1. macOS erroneously reports a 5Gbps connection when connected at 10Gbps.
  2. Linux supports only 5Gb transfer rate as of 4.12.13 Kernel.
  3. Not compatible with Thunderbolt 1 PCIe Expansion systems.


Mac OS logoWindows logoPCI Express LogoRoHS Compliant logo