preupgrade or netinstall from i686 to x86_64

[mcforum]

I don't see an option in preupgrade to go from F13 i686 to F14 x86_64.
Is it possible?

>>>
You could try but you really would not like doing it.  If you have 32 bit 
programs you want to continue to use, There is a "multilb" install that keeps 
the ability to run such.  It requires synchronizatrion of all the system code 
and libraries between the x86 and x86_64.  They are constantly getting out of 
synchronization causing yum to fail until the offending package can be manually 
brought back into sync.  Ffinding your way from an upgrade of F13 to F14 then to 
F14 with updates will be painful.  You can keep some of your customization with 
a backup of /home and anything else you want to keep.  The system settings 
stored in /etc are much more difficult.

If you have the disk space you could install the F14 x86_64 as a dual boot then 
get the various parts of your earlier system and copy them to the new.

Robert McBroom