Sonnet Allegro Max USB-C 20Gbps 1-Port PCIe Card

$36.85
None availableas of 02/14/2026

Ships when available. Free shipping on most items when you spend $100 or more.

Special orders typically ship in 1-12 weeks.

Compliance and certifications

  • WEEE
  • RoHS
Rated excellent by our customers Read our reviews

Secure checkoutISO 9001:2015 and CMMC certifiedFamily owned since 1982

Free shipping on most items when you spend $100 or more.

Real people answer: chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.

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Secure checkoutISO 9001:2015 and CMMC certifiedFamily owned since 1982

Free shipping on most items when you spend $100 or more.

Real people answer: chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.

Overview

About the Sonnet Allegro Max

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 5Gbps or 10Gbps, 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 20Gbps 1-Port PCIe Cardinstalled into a PCIe®card slot of your Mac Pro®(requires macOS®Sonoma 14.4 or later), Windows or Linux computer, you can upgrade to the benefits of SuperSpeed 20Gbps 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 20Gbps 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.

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.

Mac, Windows, and Linux Compatible

Compatible with your Mac Pro (requires macOS Sonoma 14.4 or later), Windows, or Linux computer.

Sonnet Support

Founded in 1986 in Orange County, Southern California - the vibrant hub of technology and engineering south of Silicon Valley - Sonnet has been at the forefront of innovation. Over the years, we've developed numerous award-winning products that enhance performance and connectivity for Mac, Windows, and other industry-standard computers. Many of our team members have been with us for over two decades, providing us with extensive expertise about our current and past offerings. If you ever need technical support for any of our products, don't hesitate to reach out; we're here to assist you.

Technical specifications

Technical Specifications of the Sonnet Allegro Max

General Information

General Information specifications
Manufacturer Sonnet Technologies, Inc
Manufacturer Part Number USB3C-1M20G-E
Manufacturer Website Address http://www.sonnettech.com
Brand Name Sonnet
Product Line Allegro Max
Product Name Allegro Max USB-C 20Gbps 1-Port PCIe Card
Product Type USB Adapter

Technical Information

Technical Information specifications
Host Interface PCI Express 3.1 x4
Features Thunderbolt 4 CompatibleThunderbolt 3 Compatible
RAID Supported Yes

Media & Performance

Media & Performance specifications
Data Transfer Rate 2.50 GB/s640 MB/s1.25 GB/s
UASP Support Yes

Interfaces/Ports

Interfaces/Ports specifications
USB Version 3.2 Gen 2
Total Number of USB Ports 1
USB Connector Type Type-C

Software

Software specifications
Operating System Supported Windows 10Windows 11macOS 14.4 SonomamacOS SequoiaLinux

Physical Characteristics

Physical Characteristics specifications
Form Factor Plug-in Card

Miscellaneous

Miscellaneous specifications
Package Contents
  • Allegro Max USB-C 20Gbps 1-Port PCIe Card
  • 2 x PCIe Mounting Brackets (full-height and low-profile)
Brand Compatibility Apple
Application / Usage DesktopHard DriveSolid State DriveNotebook
Platform Supported PCMac
Environmental Compliance Waste Electrical and Electronic Equipment Directive (WEEE)Restriction of Hazardous Substances (RoHS) 3

Warranty

Warranty specifications
Limited Warranty 2 Year

Ratings and reviews

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Shipping and returns

Free shipping on most items when you spend $100 or more. In-stock items ship on the next open shipment slot. The buy box above shows the live order-by countdown and the estimated arrival date.

Special order item. This item ships direct from the manufacturer and cannot be cancelled once ordered. If you have any questions before ordering, ask us first: chat with us or call 1-800-692-8757.

Questions about shipping or returns? Chat with us, email customerservice@colamco.com, or call 1-800-692-8757, Monday to Friday, 8am to 5pm EST.