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The Unabridged Pentium 4 IA32 Processor Genealogy by Bob Colwell, Tom Shanley

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The Core

General

The Pentium® II processor core represented a slightly modified Pentium® Pro processor core. It has the following differences:

  • The MMX register set and instruction set was added (see “MMX Capability” on page 519 for a description of MMX).

  • Four new instructions were added to the instruction set. See “Instruction Set Changes” on page 707.

  • The L1 Code and Data Cache sizes were increased in size from 8KB each to 16KB each.

  • While the Pentium® Pro included ECC protection on both the L1 and L2 Caches, the early versions of the Pentium® II did not have ECC protection on the L2 cache. The later versions added it back in.

  • The Pentium® Pro did not exhibit optimal performance when executing legacy 16-bit code. The Pentium® II corrected this problem ...

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