Astrotek 4+1 USB Port PCI Card: VT6212 chipset, 4 x USB 2.0 Port External + 1 x Internal USB 2.0 Port (Shared), Max. 480 Mb/s transfer rate per port, PCI specification v2.2 compliant, USB 2.0 specification rev. 2.0 compliant, USB 2.0 EHCI rev. 1.0 & UHCI rev. 1.1 compliant, 4 downstream ports in the root hub with integrated physical layer transceivers, PCI Power Management Interface specification v.1.1 compliant, 4 DMA engines with pipelined control for data transfer, Dynamic clock stop control for power consumption reduction, Drivers support Windows 98SE or above