Hi guys pretty new to my mac and notice the spinning wheel a few times, So some questions if you can help me please. I have the base 2011 Imac so it is 4gb Ram which is 2x2 I believe? So questions are 1) what's the max ram I can install. 2) if I intend to get 16gb, is 4x4 or 2x8 better as I believe there are 4 slots? Many thanks for your help in advance.