My Mobo is a P5N-E (Asus). I got it with 2 GB of RAM and I'm running a 64-bit Windows 7 OS. I want to upgrade to 4 GB of RAM. Currently, there are 2x1GB sticks and I'd like to add two more. I believe my computer was set up such that the sticks are running in dual channel. I really don't quite understand what that means. If I add two more sticks, does this mean I have quad channel? Are such settings automatic? Any advice as to which memory sticks I should buy? I haven't pulled my computer apart to see what I have, but according to CPU-Z, it's CM2X1024-PC6400. I understand that I need to add the exact same two memory sticks, so is this information sufficient?