MMX Not Implemented
Although the Pentium® and all IA32 processors subsequent to the Pentium® Pro implemented the MMX register set and instruction set, the Pentium® Pro did not. It implemented neither the MMX register set nor the MMX instruction set. It should be noted, however, that the Pentium® II Overdrive processor (see “Pentium® II Overdrive Processor” on page 159 on the CD) was a pin compatible replacement for the Pentium® Pro and it did implement MMX.
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