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

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


- Compatible with 2019 Mac Pro
- Adds Two USB-C 10Gbps Ports to Your Computer
- Supports USB-C Bus-powered Devices with up to 15W (3.0A) power per port
- Provides Independent Power Regulation for Each Port to Prevent Accidental Disconnects
- 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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Amazing USB 3.2 Gen 2 Performance

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

When it comes to supporting the fastest USB drives available, your computer’s USB 3.0 ports are perfectly adequate…for connecting peripherals that don’t depend on the ultimate USB 3.2 speeds. However, common USB 3.0 ports can be underachievers—at 5Gbps, they can’t support the maximum performance from many storage devices, and may not provide enough power to enable them to operate. You need SuperSpeed USB-C®!

The Allegro™ USB-C PCIe card supports data transfers at up to twice as fast as USB 3.0, and can also deliver 15W of power per port to USB-C bus-powered devices (three times the 4.5W specified in the USB 3.0 spec). Don’t settle for mediocre performance or insufficient power for the fastest SSDs—install an Allegro USB-C card to instantly add two Gen 2 USB 3.2 ports to your system and take full advantage of today’s SSD performance.


Full Power

Sonnet specially engineered the Allegro USB-C card to provide 15W of power through each of its ports. The ports communicate with the host that 3A of VBUS current is available, enabling this Sonnet solution to support USB-C bus-powered SSDs and SSD RAID devices that need 15W during demanding write operations.


The Sonnet Speed Advantage

Featuring the latest high-performance USB 3.2 Gen 2 controller from ASMedia—the ASM 3142—the Allegro USB-C PCIe card supports concurrent data transfers up to 925 MB/s when connected to a two USB-C Gen 2 NVMe SSD devices! Most other cards limit concurrent transfers to half that, a significant disadvantage when time is of the essence.


Regulates Power to Each Port

Ordinary USB-C adapter cards deal with power delivered through the ports as an afterthought, requiring an additional power source for the card and providing little regulation. The Allegro is no ordinary adapter card. The card regulates its own power without requiring a back-of-the card power cable connection, thus enabling full compatibility in any computer or Thunderbolt expansion system that doesn’t have these power connectors available.

Sonnet’s Allegro PCIe card is unique in regulating power to each port independently, giving each one protection from power glitches on the adjacent port. Without this protection (such as found on an ordinary card), connects and disconnects of one device may cause auto-disconnects of the other.


Resettable Fuses

The Allegro features a resettable fuse on each port to protect the card and computer should there be a cable or peripheral failure. Should a fuse trip on the Sonnet card, you can reset it simply by shutting down the 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.


Easy Installation

This Allegro USB-C PCIe installs easily into any PCIe x4 (mechanical) slot; both low-profile and full-height mounting brackets are included. 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.




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, 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 x4 low-profile computer card; full-height mounting bracket attached, low-profile bracket included


Bus Interface

PCI Express 3.0 x2


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

- HD, SSD, SSD RAID, DVD & Blu-ray devices

- 3A per port advertised using USB Type-C Charging

- 15W per port for operation or charging


Cables Supported

- USB-C 10Gbps

- USB-C 5Gbps (not recommended)

- Thunderbolt 3 40Gbps

  1. These TB3 cables support Sonnet ThunderLok 3

- Thunderbolt 3 20Gbps (0.5-, 0.7-, 0.8-meter cables only)



ASMedia 3142


RoHS Compliant



USB Support


Number of Ports

2 external



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


Chipset Throughput

16 Gbps combined port throughput


Number of Devices Supported

Up to 31


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 PCIe Adapter Card with attached full-height mounting bracket
- Low-profile mounting bracket


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