I currently have 6GB of RAM in my Mac Pro Intel Tower. runnning CS3 Photoshop. I often work with very large images of up to 1 -2 GB per image. Would it help the performance if i got another 2 - 4GB of RAM ?? I often see Pro Studios have 10 - 20 GB of RAM in their Mac Pros... So it must help, i would presume ....? any advice ? thanks!