How to install Mac OS X 10.5 Leopard on a PowerMac G4 450 MHz Dual - YouTube
http://www.macupdate.com/app/mac/2656... Mac OS X 10.5 can only be installed on a PowerMac G4 867MHz or better and any Intel Mac. Here is how to install Mac OS X 10.5 Leopard on a PowerMac G4 450 MHz Dual, all you need to do is follow instruction on this ...