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Chapter 2 System Overview
2.4.3 PROCESSORS
The Compaq iPAQ desktop series includes models based on Celeron and Pentium III processors.
These processors are backward-compatible with software written for the Pentium II, Pentium
MMX, Pentium Pro, Pentium, and x86 microprocessors. Both processor architectures include a
floating-point unit and first and secondary caches providing enhanced performance for multimedia
applications.
2.4.3.1
Celeron Processor
Select Compaq iPAQ systems use the Intel Celeron processor. The Celeron processor provides
economical performance and is compatible with software written for previous generation
processors such as Pentium II, Pentium MMX, Pentium, and x86 processors. Featuring a Pentium-
type core architecture, the Celeron processor integrates a dual-ALU CPU with a floating-point
unit, 32-KB first-level cache, and 128-KB second level cache, all of which operate at full
processing (CPU) speed. Celeron processors shipped with these systems provide the same level of
MMX/SSE support as Pentium III-based systems.
The Celeron processor uses a Flip-Chip (FC) PGA370 package with a heat sink.
2.4.3.2
Pentium III Processor
The Intel Pentium III processor provides maximum performance for Compaq iPAQs. The Pentium
III processor is compatible with software written for Celeron, Pentium II, Pentium MMX, Pentium,
and x86 processors.
The Pentium III processor core integrates a dual-ALU CPU with a floating-point unit and 32-KB
first-level cache operating at processing (CPU) speed. Featuring .18-micron technology, the
Pentium III processor features 256 kilobytes of secondary cache included on the CPU die and
operating at full processor speed.
The Pentium III processor includes MMX technology for enhanced multimedia performance. Also
included are 70 additional streaming SIMD extensions (SSE) for enhancing 3D graphics and
speech processing performance and a serial number function useful for asset tracking.
The Pentium III processor employed in these systems uses a Flip-Chip (FC) PGA370 package and
heat sink (Figure 2-10).
2-14
Compaq iPAQ Series of Desktop Personal Computers
Second Edition – February 2001
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