 One Extensible Host Controller Interface (xHCI) controller and two Enhanced Host Controller Interface (EHCI) controllers are integrated into the X99 chipset, providing a total of up to 14 USB ports.Out of those ports, up to six can be configured as USB 3.0 ports with speeds of up to 5 Gbit/s per port, while the remaining are USB 2.0 ports with speeds of up to 480 Mbit/s per port.Each USB port may also be enabled or disabled as needed.