Sonnet Allegro 4-Port USB-A 3.2 Gen 1 PCIe Card

BH #SOUSB34PME • MFR #USB3-4PM-E
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Sonnet Allegro 4-Port USB-A 3.2 Gen 1 PCIe Card
Key Features
  • Four External USB-A 3.2 Gen 1 Ports
  • PCIe 2.0 x1 Interface
  • Up to 7.5W of Power per Port
  • Backward Compatible with USB 2.0
Connect USB-A devices to your compatible Windows, Mac, or Linux system using the Allegro 4-Port USB-A 3.2 Gen 1 PCIe Card from Sonnet. Built with a full-height form factor and a PCIe 2.0 x1 interface, this card has four external 5 Gb/s USB-A 3.2 Gen 1 (3.1 Gen 1/3.0) ports, each of which also provides up to 7.5W of charging power for compatible devices. Backward compatible with USB 2.0 and 1.1 devices, this card features hot-pluggable and hot-swappable device connection support with automatic device configuration and works with most USB-IF compliant USB peripherals. Additionally, this card may be used in external PCIe expansion enclosures via Thunderbolt 5, 4, 3, or 2 connectivity.
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Sonnet Allegro Overview

Connect USB-A devices to your compatible Windows, Mac, or Linux system using the Allegro 4-Port USB-A 3.2 Gen 1 PCIe Card from Sonnet. Built with a full-height form factor and a PCIe 2.0 x1 interface, this card has four external 5 Gb/s USB-A 3.2 Gen 1 (3.1 Gen 1/3.0) ports, each of which also provides up to 7.5W of charging power for compatible devices. Backward compatible with USB 2.0 and 1.1 devices, this card features hot-pluggable and hot-swappable device connection support with automatic device configuration and works with most USB-IF compliant USB peripherals. Additionally, this card may be used in external PCIe expansion enclosures via Thunderbolt 5, 4, 3, or 2 connectivity.

PCIe Interface
The Allegro features a PCIe 2.0 bus interface to take advantage of your computer's fast expansion card slots. This card installs easily into any PCI Express (PCIe) slot that supports a full-height card, features hot-pluggable and hot-swappable device connection support with automatic device configuration, and works with all USB-IF compliant USB peripherals.
Powerful Ports
Sonnet specially engineered the Allegro PCIe card to provide extra power through its ports without the need for you to connect an auxiliary power cable. Delivering up to 7.5W of power, this Sonnet solution supports USB 3.2 Gen 1 bus-powered hard drives, SSDs, DVD, and Blu-ray devices without the need to connect an additional AC power adapter. The Allegro also supports the USB 3.2 Gen 1 charging specification that enables you to simultaneously charge and sync your iPad, iPhone, or other device that supports USB 3.2 Gen 1 charging at up to 1.5A per device.
Add Four USB 3.2 Gen 1 Ports to Older Mac Computers with USB 2.0
Got an older Mac with USB 2.0 ports, no PCIe slots, and a Thunderbolt 5, 4, 3, or 2 port? The Allegro is a great way to add four 5 Gb/s USB-A ports 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
Have a multi-slot Thunderbolt 5, 4, 3, or 2 to PCIe card expansion system with an open slot? Installing an Allegro USB-A 3.2 Gen 1 PCIe 4-Port card is an excellent way to inexpensively add four 5 Gb/s USB-A 3.2 Gen 1 ports to your computer.
Mac Compatibility
  • Mac Pro 3,1, 4,1, 5,1, 7,1 (2019), or 14,8 (2023)
  • macOS 10.8.5+
  • macOS Sonoma compatible
Windows Compatibility
  • Computer with PCIe slots
  • Windows 11, 10, 8, 7
  • Windows Server 2025, 2022, 2019, 2016, 2012, 2008 (64-Bit editions)
Linux Compatibility
  • Computer with PCIe slots
  • Linux Kernel 5.4.0+
  • Ubuntu 20.04.1+
Thunderbolt Compatibility
  • M Series or Intel Mac with Thunderbolt 5, 4, 3, or 2 ports via a Thunderbolt-to-PCIe card expansion system
  • Windows PC with a Thunderbolt 5 or 4 port via a Thunderbolt-to-PCIe card expansion system
  • Linux computer with a Thunderbolt 5 or 4 port via a Thunderbolt-to-PCIe card expansion system
UPC: 732311009440

Sonnet Allegro Specs

Key Specs
Inputs/Outputs
4x USB-A 3.0 / 3.1/3.2 Gen 1 Female
Expansion Slot Compatibility
PCIe 2.0 x1
Slot Compatibility
Full Height
OS Compatibility
macOS 10.8.5 or Later
Windows 7 to 11
Windows Server 2008 or Later
Linux 5.4 or Later
Ubuntu 20.4.1 or Later
General
Inputs/Outputs
4x USB-A 3.0 / 3.1/3.2 Gen 1 Female
USB Bus-Power Support
7.5 W per Port
Expansion Slot Compatibility
PCIe 2.0 x1
Slot Compatibility
Full Height
Software System Requirements
OS Compatibility
macOS 10.8.5 or Later
Windows 7 to 11
Windows Server 2008 or Later
Linux 5.4 or Later
Ubuntu 20.4.1 or Later
Physical
Certifications
RoHS
Packaging Info
Package Weight
0.3 lb
Box Dimensions (LxWxH)
8.65 x 5.35 x 1.35"

Sonnet Allegro Reviews

works as described

By Dushan
Rated 5 out of 5
Date: 2026-05-12

First I tried a different card with my 2012 MacPro running Catalina, and that one didn't work. This one works as described.

Just works!

By David
Rated 5 out of 5
Date: 2024-05-30

Had troubles finding a card that would work with an Elgato CamLink 4k. This worked flawlessly.

See any errors on this page?

what are the physical dimensions?

what are the physical dimensions?
Asked by: Cyril
The Sonnet USB3-4PM-E Allegro 4-Port USB 3.2 Gen 1 PCI Express Card is a full-height, half-length card. The dimensions are as follows: 111.15 × 167.65 × 20.32 mm| 4.376 × 6.600 × 0.8 inches.
Answered by: Calvin M
Date published: 2023-01-27

Will this be compatible with the new Mac Pro ...

Will this be compatible with the new Mac Pro 2019?
Asked by: ethan
I would assume the new Mac Pro has USB 3.0 ports. I purchased this to add USB 3 ports to my 2009 Mac Pro which had only USB 2.0.
Answered by: Lynn
Date published: 2020-03-13

How many channels/controllers does it have?

How many channels/controllers does it have?
Asked by: Cindy
The Sonnet USB3-4PM-E Allegro 4-Port USB 3.2 Gen 1 PCI Express Card has a single Fresco Logic FL1100, or FL1100EX 5Gbps controller.
Answered by: Paige K
Date published: 2023-11-02

Will this card work on PCI Express 1.0?

Will this card work on PCI Express 1.0?
Asked by: James J
You can but it is not recommended as there may be a performance hit.
Answered by: Gregorio M.
Date published: 2021-01-08

do need power supply with this card?

do need power supply with this card?
Asked by: David
No, the Sonnet USB3-4PM-E Allegro 4-Port USB 3.2 Gen 1 PCI Express Card BH #SOUSB34PME gets power from the PCIe slot.
Answered by: Miguel M
Date published: 2021-01-10

Will this card work on PCIe 1.0?

Will this card work on PCIe 1.0?
Asked by: James J
Yes, although bandwidth would be limited to PCie 1.0 speeds.
Answered by: Miguel M
Date published: 2024-03-28

What data transfer speeds are people getting with ...

What data transfer speeds are people getting with this card? I installed it on my Mac Pro 5,1 and the Black Magic speed test is only showing about 80-90 MB/s on a fairly new Western Digital USB3.0 external SSD. The Samsung SSD I have in the other PCIe slot is getting around 1300MB/s so I know it's not the computer. Western Digital's specs for this SSD are up to 5gbps. I was expecting at least around 500MB/s with this card.
Asked by: Chris
We haven't tested it in your scenario. But the max theoretical limit of USB 3.1 Gen 1 is 625MB/s. You may wish to try your WD SSD on another port, not using this card and/or on another computer.
Answered by: Daniel
Date published: 2021-03-25

Will this work with an Elgato Cam Link 4k?

Will this work with an Elgato Cam Link 4k?
Asked by: David
Yes, the Sonnet USB3-4PM-E Allegro 4-Port USB 3.2 Gen 1 PCI Express Card will work with the Elgato Cam Link 4K.
Answered by: Sagi C
Date published: 2024-05-15
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