I am going to change my iMac's Memory from 4 GB to 8 GB. I have the March 2009 version of the iMac. 3.06 Ghz, ATI Video 4850, and so on. I would like to know in everyone's opinion how much of a performance gain I could get? This is the software that I use that may be memory dependent, PhotoShop CS, Final Cut Express 4.0, Other Video Editing software, I also use Handbrake to convert my presently owned DVD's into a iphone format, would that convert any faster or is that only a processor factor? Any and All opinions are welcomed.