Upgrading a system to amd64

[Vizion]

> -----Original Message-----
> From: owner-freebsd-questions at freebsd.org 
> [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of 
> David Southwell
> Sent: Tuesday, August 15, 2006 3:29 AM
> To: freebsd-questions at freebsd.org
> Subject: Upgrading a system to amd64
> 
> 
> Hi
> 
> I have a freebsd Generic System 6.0-RELEASE #0 compiled 
> Thursday Nov 3 2005 originally on an Abit VA-20 motherboard 
> equipped with an AMD sempron cpu in its 462 socket. 
> 
> The Abit motherboard died due to a chip failure and I did not 
> feel like taking a risk using of the same thing happening again.
> 
> I purchased a Gigabyte GA-K8N51GMF-9 and installed an AMD 
> Athlon 64 3200+ processor in the socket 939 and transferred 
> the hardware to it.
> 
> Apart from not yet getting X-windows to work I am pleased to 
> report that system seems to be functioning well.(I have not 
> yet worked out how to change the X config to support the 
> nVIDIA GeForce 6100 chipset).
> 
> I now want to upgrade the system to FreeBSD 6.1-RELEASE-AMD64 
> and downloaded the appropriate iso images onto cd.
> 
> Wopuld anyone care to offer some advice on the best way to 
> proceed bearing in mind it is a very long time since I last 
> upgraded in this way.
> 
> Thanks
> 
> David
As I have not had a reply - i wondered if I had made my reasons for posting sufficiently. 

I wonder whether moving the system from one hardware configuration to another makes upgrading more difficult(or even impossible) and how do I overcome challenges that others may foresee?

Thanks