Comming from an Engineer, no don't wait. You will need a 64 bit OS with programs that are 64 bit to take an advantage of the 64 bit architecture. However 64 bits doesn't necesarilly (i need spell check) it will be better. You need to look at all the features of the chip, ie pipeline stages, how long to flush the pipeline, floating point operations, memory, is it more risc tahn cisc visa versa, exception handling etc....
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