400mhz imac OS9.1 Only limit I've found is the limited range of cheap/free modelers for mac. I wish some magazine would give away Cinema4d5 for mac like PCFormat did for PC's Incidently I contacted MacFormat to see if they could put it on their coverdisk and they replied that their circulation was too small to cover the cost of the programme and they'd lose money if they gave it away! Baz