architecture - 32 bit v/s 64 bit -

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i have small confusion.
when talk 32-bit architecture , 64-bit architecture mean. mean 32 bit architecture has 32 bit registers or 32 bit address-bus or 32-bit data bus.

what implied?

i usually, mean 64-bit system has 64-bit address registers. in modern systems, data registers @ least large address registers, data registers , data bus equivalently sized.

a 64-bit system, however, not have 64-bit address bus. there's no point, since there hasn't been enough ram manufactured in history of planet need full 64 bit physical address bus. given system have maximum amount of physical ram can address, based on width of address bus.


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