Hi, I'm trying to look up info about this and have seen some tests and all, but was hoping the experts here can shed some more light for me. It looks like there is definite improvement with the new chips, even with the middle core2duo chips, but not huge improvements. Am i really missing out with keeping my cd mbp? My mbp has 256mb video memory, is that helpful? Are there programs that the new ones can run that mine wouldn't be able to? Thanks so much for your insight!!