The major feature of the MMX Pentium was the addition of a set of instructions for vector processing of small integer arrays of various sizes, however other changes appear to have been made as the CPU appears to be about 20% faster than non-MMX Pentiums of the same clock speed for non-MMX applications. Presumably the parallel processing capabilities of the CPU were enhanced. A 200MHx Pentium MMX should test at about 400MIPS. (Intel seems to have misplaced the performance data on their web site. I was unable to determine their exact claims).
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