I ahdnt really looked nothing up but talking out my ass. Id say the 64 bit is faster cause a 32 bit string would be smaller. Id figure to accumated 64 bits of info it would be wider and more pathway's leadign to the processor.Might not be 100 correct but id be intrested in a simple explain on it.
64's are faster but not like double or something fantastic like that.They also come with a huge price and that is almost double.
Whats intresting though is you got Supercomputer,.
Server's
Desktop.
64's are really just downgraded server chip's atleast the FX was.Guessing the Athlon 64 is a sibling.the search for bigger and better has broken the desktop/server barrier.You think they make a 128 bit to make server's sererate again will desktop's not follow.