I currently own a mac pro 8-core 3.0ghz from 2007. It only has 5 gigs of memory. It's also been mysteriously restarting on its own and occasionally having trouble booting up, so I'm thinking its time to get a new machine. I'm leaning towards the 6-core 3.33ghz model and dropping in 16 gigs of ram but do you think this will be a significant upgrade speed wise? This machine would be mainly used professionally for graphic design (cs5), and occasionally Maya. Any thoughts would be appreciated.