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I really doubt you'll notice much in terms of a speed difference.
The big deal with 64 bit operating systems is the ability to address way larger amounts of memory. Not too big a deal for the average home user.
The limiting factor on performance for most people's systems is the disk subsystem anyway.
Throw in the fact that drivers are a royal pain... and it just isn't worth the headache.
Ask again in 2 years!
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