Intel Pentium Pro 256 KB - KB80521EX 256K

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Specifications

This part is an engineering sample.

Tools

Intel Pentium Pro MHz specifications

General information

Type

CPU / Microprocessor

Market segment

Server

Family

Intel Pentium Pro

CPU part number

KB80521EX 256K is an OEM/tray microprocessor

Package

387-pin Modified Staggered Ceramic Pin Grid Array with gold plated heat spreader
2.66" x 2.46" (6.76 cm x 6.25 cm)

Socket

Socket 8

S-spec numbers

	ES/QS processors
Part number	Q0720	Q0721	Q0754	Q0755	Q0765	Q0766
KB80521EX 256K	+	+	+	+	+	+

Architecture / Microarchitecture

Microarchitecture

Manufacturing process

0.6 and 0.35 micron
5.5 million transistors

Data width

32 bit

Data bus width

64 bit

Floating Point Unit

Integrated

Level 1 cache size ?

8 KB four-way set associative code
8 KB two-way set associative data

Level 2 cache size ?

256 KB

Pipeline

12-stage

Multiprocessing

Up to 4 processors

Low power features

Stop Grant mode ?
Auto HALT mode ?

CPUs, related to Intel Pentium Pro KB80521EX 256K

Model Freq. L2
cache Multi-
processing TDP Features

Intel Pentium Pro family, Socket 8

   Pentium Pro KB80521EX 256K 256 KB 4

   Pentium Pro 133 MHz (KB80521EX-133 256K) 133 MHz 256 KB 4

   Pentium Pro 150 MHz (KB80521EX150 256K) 150 MHz 256 KB 4 29.2 Watt

   Pentium Pro 166 MHz (KB80521EX166 512K) 166 MHz 512 KB 4 35 Watt

   Pentium Pro 180 MHz (KB80521EX180 256K) 180 MHz 256 KB 4 31.7 Watt

   Pentium Pro 200 MHz (KB80521EX200 256K) 200 MHz 256 KB 4 35 Watt

   Pentium Pro 200 MHz (KB80521EX200 512K) 200 MHz 512 KB 4 37.9 Watt

   Pentium Pro 200 MHz (GJ80521EX200 1M) 200 MHz 1 MB 4 47 Watt

Other families, P6 micro-architecture, Socket 8

   Pentium II Overdrive 333 MHz (PODP66X333) 333 MHz 512 KB MMX

• Highlighted numbers and features indicate whether specific processor performs better or worse than Pentium Pro KB80521EX 256K

• Engineering samples are marked with this color

• Within each category, the CPUs are sorted from slower (at the top) to faster (at the bottom)

• Features abbreviations:

MMX - MMX instructions

Pictures (1)

Engineering sample
256 KB L2 cache 387-pin modified SPGA Gold plated heat spreader Image reduced 2x times Engineering sample

CPU ID

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Last modified: 8 May 2013