The pexusb3s44v 4 port pci express usb 30 card lets you add four dedicated 5 gbps usb 30 ports to your pcie x4 enabled pc this independent port architecture improves usb 30 performance by transferring data on four individual channels to your computer giving you faster file transfers when multiple devices are connected traditional single bus usb 30 cards share your maximum bandwidth between all ports by employing four host controller chipsets each port operates on a separate independen