HP Vectra XW Optimization Manual page 56

Two levels of Integrated
Cache
Level-One Caches
Level-Two Cache
2 Technical Reference
The Intel Pentium Pro Processor
The Pentium Pro processor integrates three cache memories in the
same package: an 8 KB level-one data cache; an 8 KB level-one
instruction cache; and a unified level-two cache of 256 KB or 512 KB
(depending on model). The cache level refers to the proximity of the
cache to the processor's pipelines; the level-one caches are closer to the
pipelines than the level-two cache. The caches are hierarchical, so that
any data or instructions stored in level-one cache memories will also be
stored in the level-two cache memory.
The Pentium Pro's two 8 KB level-one caches are similar to the level-one
caches integrated in the Pentium processor. Both level-one caches use
a two-way set-associative organization, meaning that they consist of
two, separate logical banks of equal size (4 KB each).
The Pentium Pro's level-two cache stores both data and instructions.
The level-two cache uses a four-way set-associative organization (four
banks of 64 KB or 128 KB). Set-associative caches offer greater
flexibility for storing data items that have similar memory addresses.
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