Using 64bit you may adress and handle more data but your performance (if everything is the same) compared to 32bit will be slower, simply because handling larger memory address pointers is more cpu time consuming.
However, 64bit is needed for instance in large database systems where you can handle hundreds of gigabytes of RAM for the complete SGA, located all in memory.
On the desktop, for most of the time, 64bit isn't that important, and especially not for a laptop!!
Cheers,
Bob.
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