Chipset NEC 720101. Data transfer rate USB 1.1 OHCI 1.5Mbps, 12 Mbps / USB 2.0 EHCI 480 Mbps. Bus PCI 2.2 32-bit, 33 MHz, 5V. Supports up to 127 devices. Supports devices hot swap and wake-up. Output current per port = 500mA (max). Supports windows 98, windows 98SE, windows ME, windows 2000 & windows XP.