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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Brian Griffin: Ah, if my memory serves me, this is the physics department.
Chris Griffin: That would explain all the gravity.
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