From all the apple people I have spoken to, they say the macbook pro retina is the only macbook that can support 16 gb of ram. I know you can purchase ram online, and they say it is compatible with your laptop...So I too am wondering who is right and who is wrong??
It looks like if we want to run 16 gb of ram, we HAVE TO go with the retina. I would have prefered to just get a normal macbook pro, and instead of putting those extra dollars to the retina display...use it to juice up a regular macbook pro, with more storage, processor speed and ram.