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BUDGET-FRIENDLY
Connect and
Power
the fastest USB 3.2 SSDs
Allegro Max
1-Port USB-C 20 Gbps (USB 3.2 Gen 2x2) PCIe Card
for Mac, Windows, and Linux

Transfer Files From 20Gbps USB-C SSDs
at Maximum Speed
Your computer’s USB ports are perfectly adequate…for connecting peripherals that don’t depend on the ultimate USB 3.2 speeds. Onboard USB ports can be underachievers — at 5 Gbps or 10 Gbps, they can’t support the maximum performance of USB 3.2 Gen 2x2 storage devices — up to 2000 MB/s — and may not provide enough power to enable them to operate. With Sonnet Allegro™ Max USB-C 20 Gbps 1-Port PCIe Card installed into a PCIe card slot of your Mac Pro, Windows or Linux computer, you can upgrade to the benefits of SuperSpeed 20 Gbps USB-C!
Video shuttle drive.
Mass photo storage.
Portable gaming.

The Sonnet Advantage
Full Power
Sonnet engineered the Allegro Max card to provide 15W of power through its USB-C port. The port communicates to 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.
No Auxiliary Power Connection Required
Ordinary USB-C adapter cards handle power delivered through their ports as an afterthought, requiring the user to connect a separate power connector. Allegro Max USB-C 20 Gbps 1-Port PCIe Card is no ordinary adapter card. The Sonnet card draws its power completely through its slot, thus enabling full compatibility in any computer system that doesn’t have these power connectors available.
Resettable Fuse
The Allegro Max card features a resettable fuse to protect the card and your computer in case there is a cable or peripheral short circuit. Should the fuse trip on the Sonnet card, you can reset it simply by shutting down the computer.
Transfer Files at Up to 2000 MB/s!
Key Features

Transfer Files at Up to 2000 MB/s
Supports file transfers from USB 3.2 Gen 2x2 storage devices at maximum speed.

Plug In Without Interference
Custom connector raised toward center of bracket prevents connector interference with PCIe slot separator.

Protects Your Computer
Resettable device overcurrent fuse protects your computer and the card itself should a cable or peripheral short circuit.

Easy Installation
Quick and easy installation into an available PCIe card slot, plus no driver installation required.

Convenient Operation
Plug in and disconnect peripherals without shutting off your computer.

Computer Compatibility
Compatible with Mac, Windows, and Linux. See Tech Specs for details.

Easy Installation. Simple Operation.
There’s no software for you to install — just insert Allegro Max USB-C 20 Gbps 1-Port PCIe Card into a x4 PCIe slot (both low-profile and full-height mounting brackets are included) — and then turn on your computer for an instant upgrade.
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 to Access Port
Sonnet designed Allegro Max card with a custom USB-C connector that locates the port near the center of the PCIe bracket. Unlike other cards that use standard USB-C connectors that are mounted close to the edge of the bracket, this Allegro card provides plenty of clearance for you to plug in and fully seat cables.
| Mac Compatibility | Mac Pro 14,8 (2023); Mac Pro 7,1 (2019); macOS 15 and 26; not compatible with macOS 27 | Windows Compatibility | Windows computer with an available x4 or larger PCIe slot; Windows 11 25H2+; Windows Server 2025 |
| Linux Compatibility | Linux computer with an available x4 or larger PCIe slot; supported Linux kernel 6.6 or later | Thunderbolt Expansion System Compatibility | Thunderbolt expansion system with an available x4 or larger PCIe slot |
| Part Number | USB3C-1M20G-E | Warranty | 2 Years |
| Form Factor | Low-profile x4 PCIe card | Bus Interface | PCI Express 3.1 x4 |
| External Connector | One USB-C port | Peripherals Supported | Industry standard USB 3 and USB 2; Thunderbolt-only peripherals are NOT supported |
| Bus-powered Peripherals Supported | 3.0A advertised using USB CC (Channel Configuration); up to 15W for operation or charging | Cable Recommended | USB-C (20 Gbps) |
| USB Chipset | ASMedia 3242 | USB 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 | Hot Plug | Supports hot-pluggable and hot-swappable device connections |
| Operating Temperatures | 0°C to 35°C (32°F to 95°F) | Package Contents | Allegro Max USB-C 20 Gbps 1-Port PCIe Card; Two PCIe mounting brackets (full-height and low-profile) |
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