Allegro USB-C 4-Port PCIe


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.


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.

SuperSpeed USB-C 10Gbps • Dual Controllers for Fast Drive-to-Drive Transfers
USB-C Charge & Sync • Four Ports with up to 7.5W Power per Port

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.

Sonnet Port Power Advantages:

Unlike ordinary USB-C adapter cards, Sonnet’s Allegro PCIe card was designed with a focus on intelligent power delivery and management for powering attached drives through its ports.

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.




Key Features
  • Four SuperSpeed USB-C 10Gbps Ports—Adds four USB-C 10Gbps ports to your Mac Pro, Windows PC, or Linux computer with PCIe slots; or Thunderbolt to PCIe card expansion system
  • Powerful Performance with Dual USB 3.2 Gen 2 Controllers—Support data transfers at up to twice as fast as USB 3.0 and USB 3.1 Gen 1; speed data transfers between connected drives
  • Powered Ports—Supports USB-C bus-powered SSD, SSD RAID, and hard drive devices with up to 7.5W power per port
  • 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
  • Broad USB Device Support & Compatibility—Supports storage, hubs, and other USB-IF compliant USB devices
  • Add USB 3.2 Gen 2 to Thunderbolt Expansion Systems—Add four SuperSpeed USB-C 10Gbps ports to Thunderbolt to PCIe card expansion systems
  • Supports Hot-Swappable Device Connection—Plug in and disconnect peripherals without shutting off your computer
  • Easy Installation—Quick and easy installation into any available PCIe slot

Additional information

Form Factor

Peripherals Supported

Industry standard USB 3.2 Gen 1, Gen 2 & 2×2; 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


In The Box

Allegro USB-C 4-Port PCIe adapter card


Mac Compatibility

Mac Pro® 3,1(2), 4,1, 5,1, or 7,1 (2019)(6)
macOS 10.12.6+(3)
macOS Big Sur compatible as follows:
– Compatible when installed in a Thunderbolt to PCIe Card
Expansion System
– 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


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

20Gbps combined port throughput

Devices Supported

Up to 62

Hot Plug

Supports hot-pluggable and hot swappable device connection


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