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3.2.2 PENTIUM III PROCESSOR
The Pentium III processor's architecture (Figure 3-3) includes the same core functionality as
described previously for the Celeron processor but includes a larger, 8-way set-associative L2 ECC
cache, additional processing features, and higher processing speeds.
Core processing speed
Figure 3–3. Pentium III Processor Internal Architecture
The following table lists the key statistics of supported Pentium III processors:
Table 3–2. Pentium III Processor Statistical Comparison
Pentium III Processor Statistical Comparison
Processor
Pentium III 533EB
Pentium III 600EB
Pentium III 667 [1]
Pentium III 733 [1]
Pentium III 800 [1]
Pentium III 866 [1]
Pentium III 933 [1]
NOTE:
[1] Standard configuration processor.
The Pentium III processor is software-compatible with Celeron, Pentium II, Pentium MMX,
Pentium, and x86 processors. The Pentium III processor also features 70 FPU-based streaming
SIMD extensions (SSE) that, when implemented by appropriate software, can enhance 3D
transforming and speech processing operations. Operating system requirements for SSE support
are as follows:
Operating SystemLevel of SSE Support
Windows 95
Windows 98, OSR0
Windows 98, OSR1
Windows 2000
Windows NT 4.0
Pentium III
FPU
32-KB
CPU
Cache
FSB
I/F
FSB speed
Table 3-2.
Core/L1/L2
Speed
Speed
533-MHz
133 MHz
600 MHz
133 MHz
667 MHz
133 MHz
733 MHz
133 MHz
800 MHz
133 MHz
866 MHz
133 MHz
933 MHz
133 MHz
No SSE support
SSE support though ISV and OpenGL 6.1 applications only
SSE support though ISV, OpenGL, and DirectX applications
SSE support with ISV, OpenGL, and DirectX applications
SSE support requires driver and Service Pack 4 (SP5 recommended)
Compaq Deskpro EX Series of Personal Computers
First Edition - August 2000
Technical Reference Guide
256-KB
L1
L2
or
Cache
FSB
Core
Voltage
1.65
1.65
1.65
1.65
1.65
1.65
1.65
3-3
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