1
Introducing the Motherboard
Chapter 1
Introducing the Motherboard
Introduction
Thank you for choosing the 661GX/800-M motherboard. This motherboard is a high
performance, enhanced function motherboard that supports Socket 478 Pentium 4 proces-
sors for high-end business or personal desktop markets.
The motherboard incorporates the SiS661GX Northbridge (NB) and SiS964 Southbridge
(SB) chipsets. The SiS661GX Northbridge chipset features the AGTL & AGTL+ compliant
bus driver technology with integrated on-die termination to support Intel Pentium 4 series
processors up to FSB 800/533/400 MHz. The memory controller supports DDR400/333/
266. It can offer bandwidth up to 3.2 GB/s under DDR400 to sustain the bandwidth demand
from host processors, as well as the multi I/O masters and AGP masters.
The SiS964 Southbridge supports Hi-Precision Event Timer (HPET) for Microsoft Win-
dows with multiple DMA bus architecture that supports isochroous request and continuous
packet transmission. It implements an EHCI compliant interface that provides 480Mb/s
bandwidth for eight USB 2.0 ports, integrates AC’97 v2.3 compliant audio controller that
features a 6-channels of audio speaker out and HSP v.90 modem support. The Southbridge
integrates a Serial ATA host controller that is SATA v1.0 compliant, supporting Ultra DMA
150. SiS964 provide dual independent IDE channels and each of them support PIO mode
0,1,2,3,4 and multiword DMA mode 0,1,2 and UltraDMA 133/100/66.
The 661GX/800-M motherboard is equipped with advanced full set of I/O ports in the rear
panel, including PS/2 mouse and keyboard connectors, COM1, VGA1, LPT1, four USB
ports, one optional LAN port, and audio jacks for microphone, line-in and line-out.
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