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Sonnet Technologies Allegro USB-C 4-Port PCIe (4-port, SuperSpeed USB-C 10Gbps [USB 3.2 Gen 2] PCIe Card with Dual Controllers and USB-C Charging)
Sonnet Technologies Allegro USB-C 4-Port PCIe (4-port, SuperSpeed USB-C 10Gbps [USB 3.2 Gen 2] PCIe Card with Dual Controllers and USB-C Charging)

Sonnet Technologies Allegro USB-C 4-Port PCIe (4-port, SuperSpeed USB-C 10Gbps [USB 3.2 Gen 2] PCIe Card with Dual Controllers and USB-C Charging)


- Compatible with 2019 Mac Pro
- Adds Four USB-C 10Gbps Ports to Your Computer
- Features Dual USB 3.2 Gen 2 Controllers for Fast Drive-to-Drive Transfers
- Supports USB-C Bus-powered Devices with up to 7.5W (3.0A) Power per Port
- Provides Independent Power Regulation for Each Port
- Resettable Device Overcurrent Fuses Protect the Card and Computer
- USB 3.0 Charging Port Handshake Support
- Simultaneously Sync and Charge iPads and Other Devices (that support USB 3.0 charging at 1.5A per device)
- Supports Storage, Hubs, and Other USB-IF Compliant USB Devices
- Supports Hot-swappable Device Connection
- Compatible with Mac, Windows, and Linux
- Works in Thunderbolt™ Expansion Systems (like Sonnet's Echo™ Express, xMac™ Pro Server, or xMac mini Server)
- 2-year Product Warranty
- Free Lifetime Customer Technical Support
- Designed in the USA

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Powerful USB 3.2 Gen 2 Performance

Add Four USB-C 10Gbps Ports to Mac Pro, Windows, and Linux Computers with PCIe Slots; and Thunderbolt to PCIe Card Expansion Systems

Equipped with SSDs, the fastest USB 3.2 Gen 2 drives you can buy today are capable of 800 MB/s data transfers—many are bus-powered, too. But, most desktop computers (even new models) include generations-old USB interfaces that will throttle that performance and may not offer adequate power to allow bus-powered drives to operate. Break through the bottleneck—install Sonnet’s Allegro™ USB-C® 4-Port PCIe card in your Mac Pro®, Windows® PC, or Linux® computer with PCIe slots; or Thunderbolt™ to PCIe card expansion system to support your fast USB drives at maximum performance.


Two Controllers, Four Ports

Featuring two 10Gbps USB 3.2 Gen 2 controllers and four USB-C ports, the Allegro PCIe card supports data transfers at up to twice as fast as USB 3.0 and USB 3.1 Gen 1 ports are capable. With two controllers onboard, the Allegro card speeds data transfers between connected drives, and enables your computer to load and off-load data more quickly.


Speed and Power

Unlike other 4-port USB cards (simple hubs that split a single USB controller’s bandwidth between all four ports), Sonnet’s Allegro PCIe card supports data transfers from a single USB 3.2 Gen 2 SSD RAID device at up to 800 MB/s— compared to using a USB 3.1 Gen 1 or USB 3.0 adapter card, transfers complete in half the time! Exploiting its dual controllers design, it’s possible to simultaneously transfer data to two connected drives at up to 660 MB/s each. With four drives connected, the four ports support simultaneous 300 MB/s transfers!

The Allegro card provides 7.5W of power through each of its ports, supporting USB bus-powered hard drives, and SSDs without the need to connect an additional AC power adapter.


No Auxiliary Power Required

Ordinary USB-C cards need a separate power plug connection. Sonnet’s Allegro gets the power required to operate connected drives from the slot it’s installed in. This enables you to install the Sonnet card in any compatible computer or Thunderbolt expansion system regardless of it having extra power connectors available.


Independent, Per-Port Power Regulation

Ordinary USB-C cards can deliver poor power regulation, allowing a connected drive to be forced off (auto-disconnected) when an additional drive is connected or disconnected. The Allegro card protects each port from power glitches on adjacent ports, preventing auto-disconnects of already-connected drives.


Resettable Fuses

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


Add USB 3.2 to Your Thunderbolt Mac

Got a Mac with a Thunderbolt connection, but no PCIe slot? The Allegro 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 systems.


Perfect for the Extra Slot in Your Multi-Slot Thunderbolt System

Installing an Allegro USB-C 4-Port PCIe card in a multi-slot Thunderbolt 2 or Thunderbolt 3 to PCIe card expansion system is a great way to inexpensively add four SuperSpeed USB-C 10Gbps ports to your computer.


Broad Device Support, Easy Installation

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




Mac Compatibility

- Mac Pro® 3,1, 4,1, 5,1, or 7,1 (2019)

- macOS 10.12.6+

- macOS Big Sur compatible as follows:

  1. Compatible when installed in a Thunderbolt to PCIe Card Expansion System

  2. Not currently compatible with Mac Pro 7,1 (2019)


Windows Compatibility

- Computer with PCIe slots

- Windows 10, 8.1, 7

- Windows Server 2019, 2016, 2012, and 2008 (64-bit editions)


Linux Compatibility

- Computer with PCIe slots

- Linux Kernel 5.4.0+

- Ubuntu 20.04.1+


Thunderbolt PCIe Expansion System Compatibility

Supports USB 3 devices when card is installed in a Thunderbolt to PCIe Card Expansion System







Form Factor

PCIe computer card


Bus Interface

PCI Express 2.0 x4


Peripherals Supported

- Industry standard USB 3.2 Gen 1, Gen 2 & 2x2; USB 3.1 Gen 1 & 2; USB 3.0, 2.0 and 1.1

- Thunderbolt 3-only peripherals are NOT supported


Bus Powered Peripherals Supported


- 1.5A per port advertised using USB Type-C Charging

- 7.5W per port for operation or charging


Cables Supported

- USB-C 10Gbps

- USB-C 5Gbps (not recommended)

- Thunderbolt 3 40Gbps (0.5-, 0.7-, 0.8-meter cables only)

- Thunderbolt 3 20Gbps



2x ASMedia 3142


RoHS Compliant



USB Support



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 10


Alternate Modes Support



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

In the box

Allegro USB-C 4-Port PCIe adapter card


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