From owner-freebsd-questions@FreeBSD.ORG  Sun Feb 27 17:58:46 2005
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From: RW <list-freebsd-2004@morbius.sent.com>
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Date: Sun, 27 Feb 2005 17:58:43 +0000
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Subject: Re: Upgrading hardware from P3 to AMD 64
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On Sunday 27 February 2005 17:49, Subhro wrote:
> > -----Original Message-----
> > From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd-
> > questions@freebsd.org] On Behalf Of RW
> > Sent: Sunday, February 27, 2005 23:06
> > To: freebsd-questions@freebsd.org
> > Subject: Upgrading hardware from P3 to AMD 64
> >
> > I'm thinking about upgrading my hardware from an Intel P3 to an AMD 64,
> > and
> > replacing the graphics card, without buying a new hard disk. Has anyone
> > done
> > this kind of thing successfully?
> >
> > I've recompiled kernel+world for 686 and I've done a portupgrade -fR on
> > cvsup
> > and portupgrade.
>
> Most likely your system would stop booting up if you try to run a p3 kernel
> on a amd64. And AFAIK you *cant* build for 64 bit architecture on a 32 bit
> one.
>

As I said, I'm recompiling for 686 (which I think is pentium pro), my 
undestanding is that the AMD 64 is back-compatible to 686.