Pentium® II/Pentium® III Differences
The following is a list of differences between the Pentium® III the Pentium® II processors:
The Pentium® III added the Streaming SIMD Extension (SSE) instruction set (initially referred to as KNI: Katmai New Instructions) consisting of 70 new instructions. See “The Streaming SIMD Extensions (SSE)” on page 758 for a description of SSE.
In support of SSE, the Pentium® III added eight, 128-bit registers (XMM[7:0]) and the 32-bit MXCSR (MX Command Status Register). Additional execution units were also added (see “The SSE Execution Units” on page 750). See “The Streaming SIMD Extensions (SSE)” on page 758 for a description of the SSE capability.
While the Pentium® II added the FPU/SSE Save/Restore instruction pair ...
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