Intel D975XBX2KR Product Guide - Page 18

Intel Desktop Board D975XBX2 Product Guide Hi-Speed USB 2.0 Support NOTE Computer systems that have an unshielded cable attached to a USB port might not meet FCC Class B requirements, even if no device or a low-speed USB device is attached to the cable. Use a shielded cable that meets the requirements for a full-speed USB device. The desktop board supports up to eight USB 2.0 ports via ICH7; four ports routed to the back panel and four routed to two internal USB 2.0 headers. USB 2.0 ports are backward compatible with USB 1.1 devices. USB 1.1 devices will function normally at USB 1.1 speeds. USB 2.0 support requires both an operating system and drivers that fully support USB 2.0 transfer rates. Disabling Hi-Speed USB in the BIOS reverts all USB 2.0 ports to USB 1.1 operation. This may be required to accommodate operating systems that do not support USB 2.0. Enhanced IDE Interface The ICH7 IDE interface handles the exchange of information between the processor and peripheral devices like hard disks, CD-ROM drives, and Iomega Zip* drives inside the computer. The interface supports: • Up to two IDE devices (such as hard drives) • ATAPI-style devices (such as CD-ROM drives) • Older PIO Mode devices • Ultra DMA-33 and ATA-66/100 protocols Serial ATA The desktop board supports eight Serial ATA channels, connecting one device per channel in either a RAID or a non-RAID configuration. Expandability For system expansion, the desktop board supports the following: • One PCI Express x16 card as an electrical x16 card or two PCI Express x16 cards as electrical x8 cards • One PCI Express x16 card as an electrical x4 card • Two PCI bus add-in cards Related Links For information about installing a PCI Express x16 card, see page 38 in Chapter 2. 18