Mac OS X Server 10.4 Requirements; Which Computers could you install OS X Server 10.3 that are no longer supported 10.4?

– PowerMac G3, G4, G5
– built-in firewire
– 256 mb ram, at least 512 for high demand-servers
– at least 4 GB disk space

Which Computers could you install OS X Server 10.3 that are no longer supported 10.4?
– early G3 computers that didnt have built-in firewire, like bondi iMac