Hey everyone, I just bought a new macbook yesterday(2.16, 1g ram, 120g hd model) and opted not to upgrade the ram to 2gig through apple cause it's cheaper to buy it from online. My question is, how do the slots work? I am not totally oblivious to computer hardware but I just want to make sure I buy the right thing for what I want. The macbook comes with 2x512 ram kit. If I upgrade to 2gig ram, do I need to buy 1gigx2 ram kit, a single 1gig ram or another 2x512 kit? Thanks for any help!!