Hi guys, Just got a quadcore 2.8 but it only comes with a pitiful 3GB memory. On Crucial's site in the UK right now and can see a few compatible sticks. http://www.crucial.com/uk/systemscanner/viewscanbyid.aspx?id=45F2DE8631D926C3 If you click that link you'll see what I can choose from. Money is pretty tight so can't stretch too far but will need RAM mostly for editing video in premiere CS5 and Final Cut Pro. Can I keep the 3GB in and just buy another set? I can afford the 3x 2GB set but would having that combo in with the 3x 1GB sticks already have much worse performance than say buying the 2x 4GB sticks and putting them in? Sorry, it's probably a bit more than a yes/ no answer actually! Any advice would be amazing, thank you!