Find Your Exadata Machine Version

Are you really curious to see which version of Exadata you are using. Just follow the step and you are ready with the information
$cat /opt/oracle.SupportTools/onecommand/databasemachine.xml |grep -i MACHINETYPE

            <MACHINETYPE>1044</MACHINETYPE>
            <MACHINETYPES>X8M-2 Eighth Elastic Rack HC 14TB</MACHINETYPES>

Note:

HP => High Performance
HC => High Capcity