My fastest Macs that *COULD* run 9 are my 1.67ghz G4 Powerbooks but I have Leopard on them so no go. My next best machine would be my Digital Audio. it came with Tiger pre-installed but I don't have a copy of Mac OS 9 to install it with. My only Mac running OS X and 9 is my snow G3 700 iMac running 10.2.8 and 9.2.2. The only bootable machine I currently have 9 on is my 6500/250. The rest of my PPC Macs run versions from 7.6.1-8.6.