• Overview
  • Tech Specs

Add USB 2.0 Connections to Your Mac or PC!

Everybody's got USB 2.0 peripherals—printers, scanners, digital cameras, external drives, an iPod®, an iPhone®—and there never seems to be enough ports on a computer to plug all of them in. If you’ve got an older computer, it probably has USB 1.1 ports, which are fine for keyboards and mice, but far too slow for transferring data to and from USB 2.0 devices. Add the low cost Sonnet Allegro™ USB 2.0 PCI adapter card to your computer and bring it up to speed with high-speed USB technology!

Considering a hub? Consider the tradeoffs. Every peripheral you plug in has to share a single port's bandwidth (potentially affecting the devices' performance), and you may have to plug it into a power outlet as well as your computer in order to operate some devices. Sonnet's Allegro USB 2.0 adds five (four external, one internal) high-speed USB 2.0 connections to your computer without the need for an external box or AC power adapter—no trade-offs necessary. Each of Allegro USB 2.0’s five powered ports supports bus-powered peripherals (devices that work without a separate power supply, including some small external drives and scanners) and hi-speed data transmission.

Key Features

Adds five USB 2.0 ports to any compatible computer without the tradeoffs of a hub

Supports hot-swappable device connection—plug in and disconnect peripherals without shutting off your computer

Supports bus-powered devices without a separate power supply

Easy installation—plug and play—no drivers to install


This Sonnet adapter features hot-pluggable and hot-swappable device connection support with automatic device configuration, so you can plug in and disconnect devices without having to shut down your computer. With no drivers to install, this card offers simple plug and play installation in Mac and Windows computers. Install Allegro USB 2.0 to add more USB 2.0 connectivity to your computer, outside and in, without compromise.

Allegro USB 2.0 USB ports diagram

See Tech Specs Tab for footnotes
Part No.  
USB2 Discontinued
Warranty 1-year
Form Factor PCI computer card
Bus Interface PCI
Number of Ports 4 external + 1 internal
RoHS Compliant Yes
Package Contents
  • Allegro USB 2.0 Computer Card
  • Documentation
USB Support  
Standard Standard USB Specification v. 2.0/1.1/1.0 compatible. Complies with OHCI (Open Host Controller Interface) and EHCI (Enhanced Host Controller Interface)
Cables Supported USB 2.0 with Standard-A male connector
Peripherals Supported Supports all industry standard USB 2.0 and USB 1.1 peripherals
Data Transfer Rate 480/12 Mbits/s
Number of Devices Supported Up to 127
Hot Plug Supports hot-pluggable and hot swappable device connection


Specifications subject to change without notice.





Mac Compatibility

Power Mac® G5 (with PCI or PCI-X slots)

Power Mac G4 (with PCI slots)

Power Mac G3 (Blue & White)

OS X® 10.5.2+, 10.4(1), 10.3(1)

Mac® OS 9 (at USB 1.1 speed)

Windows Compatibility

PC desktop (with PCI or PCI-X slots)

Windows® 8, 7, Vista®, XP (SP2)

Technical Notes

  1. Deep Sleep not supported under OS X 10.4 or 10.3.


Mac OS logoWindows logo USB 2.0 logo RoHS Compliant logo