Upgrade a 32bit Fedora install to 64bit Fedora?

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http://forums.fedoraforum.org – Like the subject says, can it be done? Anyone tried it before? I've got a server with Fedora 11 on it, which will be getting a new motherboard soon. The old board is 32bit only, but the new one will be 64bit. Would like to switch to 64bit so I can use all 8GB RAM that the new board will have plugged in. :) Would rather not do a clean install if I don't have to, as I've got a lot of "tweaks" I've done to this install plus a lot of custom configured software that would be difficult to reproduce. (HowTos)