The VisionTek 4 Port USB 3.0 x1 PCIe Internal Card lets you easily add four SuperSpeed USB 3.0/2.0 ports to your PC or Server through an available x4 or higher PCI Express slot. These ports can be used to connect your computer to external hard drives, external CD/DVD drives, MP3 players, printers, scanners, webcams, game controllers, digital cameras, and other devices. With each port providing 900mA of bus power, you can use many of your desktop devices without needing a power adapter. Each port on the VisionTek 4 Port USB 3.0 x1 PCIe Internal Card is also hot swappable, so you can attach and disconnect external drives as desired. When used with an external drive, each port can deliver up to 5Gb/s (600MB/s) data rates for transferring and/or backing up music, photos, and HD movies.