hi all. Im looking at adding more RAM to my imac 27". I right now have 2gb. I m looking at buying maybe 8 gb more. Im thinking that this will help my mac run smoother. Is there any one type of RAM that I should buy or does it not matter. And is ther anything that I have to do ? I see that the RAM port is at the bottom of it but is there anything else that I need to do for software to be transported to the new RAM or is that something separate?