Native 64bit Programs for Vista x64?

[Nothinman]

Wrong. A 64 bit processor has twice as many registers as a 32 bit one, so a CPU dependent 64 bit program will run 10-15% faster than a 32 bit one. Also, only the compiled binaries (the code) of a 64 program will use more memory than a 32 bit one. All other parts of a program (graphics, sound) will take the same.

AMD64 CPUs only have double the GPR registers because AMD chose 16 out of the air, for instance Alphas are 64-bit and have 32 integer and 32 floating point registers.