Add two usb 30 ports to your desktop computer through a pci express slot the pexusb3s23 2 port pci express usb 30 card lets you add two usb 30 ports to any pci express enabled computer system the usb card requires sata power for functionality and delivers 900ma of power per port to usb 30 bus powered devices 500ma for usb 20 via your computers sata power connector the pcie usb 30 adapter is compliant with usb 30 standards for data transfer speeds up to 5 gbps while still offerin