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CPU Socket 478. A 478-pin surface mount, Zero Insertion Force (ZIF) socket for the Intel® Pentium® 4 processor with 400 MHz system bus that allows up to 3.2GB/s data transfer rate.

24/20-pin ATX power connector. This power connector is for an ATX power supply.

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Backplane bridge board connectors. These connectors are for the bridge board that connects the motherboard to the backplane board.

Flash ROM. This 4Mb firmware contains the programmable BIOS program.

128-switch DIP (CLKSW). This 8-switch Dual Inline Package (DIP) allows you to select the CPU frequency multiple.

13ServerWorks® Champion south bridge (CSB5). The Champion South Bridge (CSB5) primarily acts as a PCI to Low Pin Count (LPC) bridge, but also supports several integrated functions including dual-channel ATA/100 IDE controller, 4-port USB 1.1 interface, ACPI power management and detection, XIO-APIC, and legacy functions 8237DMA, 8259APIC, and 8254 timer.

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Daughterboard connectors. These connectors are for the optional ASUS Server Management daughterboard.

LPC super I/O controller. This Low Pin Count (LPC) interface provides the commonly used Super I/O functionality. The chipset supports UART compatible serial ports, one parallel port with EPP and ECP capabilities, a floppy drive, and PS/2 keyboard and mouse.

16ASUS ASIC. This chip performs multiple system functions that include hardware and system voltage monitoring, IRQ routing, among others.

17LSI® SCSI controller. The LSI 53C1010R SCSI controller supports up to 30 SCSI devices through the onboard dual-channel SCSI connectors.

18Ultra-160 SCSI connector (internal). This dual-channel68-pinUltra-160 SCSI connector supports up to 30 SCSI devices, and data transfers of 160Mbps.

ASUS NR-LSR motherboard user guide

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