Intel Pentium Pro 256 KB - KB80521EX 256K


Specifications

Only samples of this part were released.
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 Q0755 Q0766
KB80521EX 256K+++
 
Architecture / Microarchitecture
MicroarchitectureP6
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
Pipeline12-stage
MultiprocessingUp 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
   Intel Pentium Pro 133 MHz (KB80521EX-133 256K)133 MHz256 KB4 
   Intel Pentium Pro 150 MHz (KB80521EX150 256K)150 MHz256 KB429.2 Watt
   Intel Pentium Pro 166 MHz (KB80521EX166 512K)166 MHz512 KB435 Watt
   Intel Pentium Pro 180 MHz (KB80521EX180 256K)180 MHz256 KB431.7 Watt
   Intel Pentium Pro 200 MHz (KB80521EX200 256K)200 MHz256 KB435 Watt
   Intel Pentium Pro 200 MHz (KB80521EX200 512K)200 MHz512 KB437.9 Watt
   Intel Pentium Pro 200 MHz (GJ80521EX200 1M)200 MHz1 MB447 Watt
Other families, P6 micro-architecture, Socket 8
   Intel Pentium II Overdrive 333 MHz (PODP66X333)333 MHz512 KB  MMX

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

 • Never released microprocessors are marked with magenta 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
Intel Pentium Pro 256 KB - KB80521EX 256K

CPU ID

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