Which Architecture Is My Computer?

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http://forums.fedoraforum.org – In "installation guide" of fedora 12 (http://docs.fedoraproject.org/install-guide/f12/en-US/html/ch-new-users.html#sn-which-arch ), i read that for Intel Core 2 Duo is necessary to install Fedora x86_64; i have this processor type and until now i have ever used i368 version. Must i will change to x86_64 version?:confused: Thanks. (HowTos)