Chapter 3 Processor/Memory Subsystem; Introduction - Compaq W4000 Technical Reference Manual

Chapter 3
PROCESSOR/
MEMORY SUBSYSTEM
3.

Chapter 3 PROCESSOR/MEMORY SUBSYSTEM

3.1

INTRODUCTION

This chapter describes the processor/memory subsystem of Compaq Deskpro Personal Computers
featuring the Pentium 4 processor. These systems feature the Pentium 4 processor and the 845
chipset (Figure 3-1). The 82845 MCH component of the 845 chipset supports SDRAM memory
of either the standard PC133 or the DDR type, depending on model.
Pentium 4
Processor
400-MHz
64-Bit FSB
FSB I/F
AGP
I/F
Present in PC133 systems only.
Covered in Chapter 4
Figure 3–1. Processor/Memory Subsystem Architecture
This chapter includes the following topics:
♦ Pentium 4 processor [3.2]
♦ Memory subsystem [3.3]
♦ Subsystem configuration {3.4]
Cntl
Mem. Bus
Memory
82845
Cntlr.
MCH
Hub I/F
Second Edition - January 2003
System Memory
XMM2
XMM1
DIMM DIMM
Socket
In
Socket
page 3-2
page 3-5
page 3-8
Compaq Evo and Workstation Personal Computer
Featuring the Intel Pentium 4 Processor
Technical Reference Guide
XMM3
DIMM
Socket
3-1