32 vs 64 bits does not give you any raw performance boost for most apps.  The

yes it will. FreeBSD/amd64 works at least 10% faster than FreeBSD/i386 on athlon64 machine, when i386 version were recompiled for P4. With default FreeBSD/i386 - it will be at least 30%.

just because it's not just 64-bit addresses, but twice the registers (r8-r15) allowing C compiler to generate more efficient code.

For now AMD64 is the fastest and cheapest architecture - at least with AMD processors, not intel clones. (YES now intel makes clones of AMD processors)
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