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From: Wojciech Puchar <wojtek@tensor.gdynia.pl>
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To: "Don O'Neil" <lists@lizardhill.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: Migrating from i386 to AMD64
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>
> Now.. Can I just use the same SMP kernel I have currently (assuming the
> correct drivers are loaded) for the X2 processor if I just want to run it in
> 32 bit mode? Or do I need to do a complete re-install/upgrade to the AMD64
> platform version of FreeBSD?

you have to reinstall completely. BUT

- make a list of installed ports
- make backup of all configuration files and data files
- install FReeBSD/AMD64 AND this ports
- THEN put all your config files and data files.

and then it should work fine. and there is noticable speed difference 
compared to i386.