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Intel Pentium Pro 256 KB - KB80521EX 256K

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Intel KB80521EX 256K specifications

General information
TypeCPU / Microprocessor
Market segmentServer
FamilyIntel Pentium Pro
CPU part numberKB80521EX 256K is an OEM/tray microprocessor
Package387-pin Modified Staggered Ceramic Pin Grid Array with gold plated heat spreader
2.66" x 2.46" (6.76 cm x 6.25 cm)
SocketSocket 8
S-spec numbers
  ES/QS processors
Part number Q0720 Q0721 Q0754 Q0755 Q0765 Q0766
KB80521EX 256K++++++
Architecture / Microarchitecture
Manufacturing process0.6 and 0.35 micron
5.5 million transistors
Data width32 bit
Data bus width64 bit
Floating Point UnitIntegrated
Level 1 cache size  ? 8 KB four-way set associative code
8 KB two-way set associative data
Level 2 cache size  ? 256 KB
MultiprocessingUp to 4 processors
Low power features
  • Stop Grant mode  ? 
  • Auto HALT mode  ? 

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CPU ID information for the KB80521EX 256K

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CPUs, related to Intel Pentium Pro KB80521EX 256K

Model Frequency L2
TDP Features  
Intel Pentium Pro family, Socket 8
   Pentium Pro KB80521EX 256K 256 KB4  
   Pentium Pro 133 MHz (KB80521EX-133 256K)133 MHz256 KB4 >
   Pentium Pro 150 MHz (KB80521EX150 256K)150 MHz256 KB429.2W>
   Pentium Pro 166 MHz (KB80521EX166 512K)166 MHz512 KB435W>
   Pentium Pro 180 MHz (KB80521EX180 256K)180 MHz256 KB431.7W>
   Pentium Pro 200 MHz (KB80521EX200 256K)200 MHz256 KB435W>
   Pentium Pro 200 MHz (KB80521EX200 512K)200 MHz512 KB437.9W>
   Pentium Pro 200 MHz (GJ80521EX200 1M)200 MHz1 MB447W>
Other families, P6 micro-architecture, Socket 8
   Pentium II Overdrive 333 MHz (PODP66X333)333 MHz512 KB  MMX>
 • Highlighted numbers and features indicate whether specific processor performs better or worse than the Pentium Pro KB80521EX 256K
 • Engineering samples are marked with this color
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 • 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
Intel Pentium Pro 256 KB - KB80521EX 256K
Comments (0)

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