The only real difference is memory allocation. A 64 bit written program can address larger blocks of memory. At least that is how its suppose to work.

So I can not for the life of me understand why Windows and Windows software is so screwed up with it comes to 32/64 bit. Its not like 64-bit CPUs are new. Even Apple abandoned them years ago.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car