32-64bit is the normal pipe size trough which code travels, so the code is made in 32bit to use the full potential. A 64 bit program will have to use to pipes for the same task, a thing that chips right now aren't really designed for so the program would be unstable. Intel was warking on a chip that was 64bit only, so old programs couldn't work. AMD instead used a 32bit core and enhanced it so it will work as a 64bit if a program would require it. Programers liked that so Intel had to drop thir ideea and is already working on a 32-64bit hibred of thir own.
If programs use a 64 bit it would be much faster
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