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Originally Posted by soccerchamp76
For the M1, M2, M3 questions
M1 is optimized for SSE2 instructions, which is on P4's and almost every processor for the past 3 years. M2 is optimized for lower processors, and M3 is optimized for processors like Pentium 1.
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Actually, you've got that backwards
M3 is for SSE2
M2 is for SSE
M1 is for MMX
Follow the 2nd link given above by TheAgent for more details.