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Technical Reference Guide
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.
Covered in Chapter 4
Present in PC133 systems only.
Hub I/F
Memory
Cntlr.
FSB I/F
82845
MCH
AGP
I/F
XMM1
DIMM
In
Socket
Mem. Bus
Cntl
400-MHz
64-Bit FSB
Pentium 4
Processor
DIMM
Socket
DIMM
Socket
System Memory
XMM2
XMM3
Figure 3–1. Processor/Memory Subsystem Architecture
This chapter includes the following topics:
♦ Pentium 4 processor [3.2] page 3-2
♦ Memory subsystem [3.3] page 3-5
♦ Subsystem configuration {3.4] page 3-8
Compaq Evo and Workstation Personal Computer
Featuring the Intel Pentium 4 Processor
Second Edition - January 2003
3-1