First of all, please accept my apologies if I am duplicating a post here; I have tried searching the forum but not found anything exactly answering my questions. I have a later 2011 13" MBP in which I would like to upgrade the RAM. I currently have 4GB and would like to go to 16GB. First question, is there any problem with going to 16GB as the Apple site details a maximum capability of 8GB. Second question, is there any manufacturers of RAM I should avoid? I have found various brands available at varying prices. Many thanks for you help.