3.System support Support Windows XP 2000 Vista and Windows 7 etc. Backwards compatible with previous USB standards including USB 2.0 and USB 1.0 Compliant with PCI Express 2.0 specs Fully compliant with USB 3.0 revision 1.0 specifications and Intel xHCI rev0.96 specifications Fully supports the following USB Communication Types: Control/Bulk/Interrupt/Isochronous Transfer Provides up to 900mA per USB port Support USB transfer speeds of 5Gbps (Super Speed) 480Mbps (High Speed) 12Mbps (Full Speed) and 1.5Mbps (Low Speed) Supports PCI Bus Power Management Interface Specification revision 1.2 Supports up to 127 USB devices connected to a single interface. (Requires additional USB hubs to obtain this number) USB ports are Hot Swapping and Plug-and-Play compliant