I currently have 2GB of Ram in my Aug 2006 2.66ghz Mac Pro in a 4x512MB configuration on Riser 1. Q1: I want to add 4GB in 2x2GB configuration (about $125 upgrade). Should I put them on Riser 1 with a 2x512MB pair, or put them alone on Riser 2? I use my Mac Pro as a non-professional. It holds all our HD family videos (about 1TB worth), family records, email, etc. and acts as a media server to the rest of the house (Apple TV, etc). Right now I have 12MB of ram free and 600MB inactive. My computer will run faster with more ram, right? Even though I'm not a crazy FCP or CS3 user? Q2: Will the upgrade help my computer run faster? Is it worth it? Thanks as always!