> SSE is Streaming SIMD (Single Instruction Multiple Data) Extensions; which 
> means processing more than one thing at a time, as simply as I understand 
> it.

More precisely, it allows you to perform the same mathematical operation 
on several numbers simultaneously. (Which is probably very useful for, 
say, vector calculations - except that I imagine POV-Ray does all that 
kind of thing at very high precition, which SSE2 won't support.)

FWIW, SSE2 is an extension of SSE is an extension of MMX. In case you 
wondered.

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