I have a late 2006 iMac, it has Processor 2.16 GHz Intel Core 2 Duo Memory 4 GB 667 MHz DDR2 SDRAM Graphics ATI Radeon X1600 128 MB Software Mac OS X Lion 10.7.5 (11G63) We have decided to upgrade to the new iMac the basic 21 inch. Will I notice a big time difference in the operating of this new iMac with regards to speed. Gaming and videoing are very seldom done. Mostly business books, emailing and web browsing, and some iPhoto stuff. in fact out of 250 GB on old one it it saying 155gb still available. Old one works awesome yet, but like a automobile you have to upgrade once in a while. Wife kinda wants her own anyway.