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What is the big diffbetween 8bit uC, 16bit, 32bit, 64bit?

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Me and my friends have been talking about this a lot lately.. with win xp64 coming out and the new OS X64 coming out.

What is the actuall difference?

From what I know about progamming, I know you can declare variables in different ways, and this can save space in ram.

I know the more bits you have, the more access to ram you can have.. but that is about all I know.

Does bits actually equate to speed directly? or is it just because you can declare variables in diff ways?

thanks! Lee
 

Normally it's referring to the width of data buses. For example 8-bit processor has 8-bit data bus...
 

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