From owner-freebsd-questions@FreeBSD.ORG  Sat Aug  6 21:30:37 2005
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Subject: Re: AMD64 vs. i386
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On Saturday 06 August 2005 21:37, Garrett Cooper wrote:
> Joseph Sniderman wrote:
> >Can I install the i386 version of FreeBSD on an AMD64(athelon64) based
> > computer?
>
>     Yes, but what what libs and programs you may install that are i386
> based as opposed to 64-bit. You can seriously 'screw' up your system by
> having several programs be unrunnable if you mix and match 32-bit stuff
> with 64-bit stuff too much. 

You only need to mix 32-bit and 64-bit software when you are running the AMD64 
version.  This is because some binaries are 32-bit only and some ports only 
work for 32-bit.  

The AMD64 version has optional compatibility with 32-bit i386 software. AFAIK 
there is no such compatibility the other way around.