From Fedora Project Wiki
#!html ==Architecture Specific Notes==
This section provides notes that are specific to the supported hardware architectures of Fedora.
RPM multiarch support on 64-bit platforms (x86_64, ppc64)
RPM supports parallel installation of multiple architectures of the same package. A default package listing such as rpm -qa might appear to include duplicate packages, since the architecture is not displayed. Instead, use the repoquery command, part of the yum-utils package, which displays architecture by default. To install yum-utils, run the following command:
su -c 'yum install yum-utils'
To list all packages with their architecture using rpm, run the following command:
rpm -qa --queryformat "%{name}-%{version}-%{release}.%{arch}\n"
You can add this to /etc/rpm/macros (for a system wide setting) or ~/.rpmmacros (for a per-user setting). It changes the default query to list the architecture:
%_query_all_fmt %%{name}-%%{version}-%%{release}.%%{arch}