Sonnet Allegro USB 3.0 PCIe Card (2-Ports, Macintosh/Windows) USB3M-E Simple way to add two SuperSpeed USB 3.0 ports to a Mac Pro or desktop PC with PCI Express 2.0 slots Transfers data up to 10x faster than over USB 2.0 connections Supports hot-swappable device connection-plug in and disconnect peripherals without shutting off your computer Powered ports support bus-powered drives