Compaq W4000 manual System Architecture, Desktop Configurable Minitower, Sdr Sdr/Ddr

Chapter 2 System Overview

2.4SYSTEM ARCHITECTURE

The Compaq Evo and Workstation systems covered in this guide feature an architecture based on the Intel Pentium 4 processor and the Intel 845 chipset (Figure 2-9). These models use either PC133 or DDR (PC266) SDRAM for system memory, provide AGP 4X graphics support, and include PCI bus expansion capability.

The Intel 845 chipset includes the 82845 MCH designed to support the Pentium 4 processor with an FSB speed of 400 MHz. The 82845 MCH also includes an SDRAM controller supporting up to three PC133 DIMMs or two DDR DIMMs, depending on model configuration.

All systems feature AC’97-compatible audio subsystems and include a microphone input, a line input and headphone and/or line output. The Small Form Factor system features Compaq Premier Sound components while Desktop and Configurable Minitower systems provide a business audio solution.

The 845 chipset also includes the 82801BA I/O Controller Hub (ICH2) that integrates two IDE controllers with ATA100 support, two USB interfaces, and a PCI bus controller. Also integrated into the 82801BA is an 82562 network interface controller. An SMC LPC47B367 Super I/O Controller provides serial, parallel, keyboard, mouse, and diskette drive interface functions.

All models covered in this guide support ATA100-type hard drives. Select Compaq Workstation W4000 models feature a SCSI PCI adapter controlling a Wide Ultra3 SCSI hard drive.

Below is a matrix defining the architectural differences based on form factor and series.

	SFF	Desktop	Configurable Minitower
Series Type	Evo/Workstation	Evo	Evo	Workstation
SDRAM Memory Speed	SDR	SDR	SDR	SDR/DDR
Audio subsystem type	Premier Sound	Business	Business	Business
Front panel audio ports	Standard	Optional	Optional	Standard
Front panel USB ports	Standard	Optional	Optional	Standard
PCI slots	2	3	5	5
Hard Drive Type	ATA100	ATA100	ATA100	ATA100 or SCSI

SDR = Single data rate

DDR = Double data rate

2-12Compaq Evo and Workstation Personal Computers

Featuring the Intel Pentium 4 Processor

Second Edition – January 2003