I have a Dell Dimension 8200 with 256 RD Ram(RD Ram memory is dual channel, 2 rimm slots per channel - what does this mean exactly?) I'm looking to upagrade the ram to 512. I went to Future shop (best buy) just to get an idea of prices and products. They have the makes Azen and Kingston Tec(mobel?) Anyway its kind of confusing with the makes and stuff for I'm not familiar with any of these names. I was just wondering if theres anything I should be aware of when buying. I have to use RD Ram correct and not SD Ram? Is there any makes I should stay away from? Or should I go to a Dell dealer here in town and buy from them? Will compatibility be a problem? Thanks in advance.