Hi! I would like to add some RAM to my Macbook, but I have a couple of doubts. I read the guide "Understanding Intel Mac RAM", and I understood I need to know my Intel Chip Type to know the max number of GBs I can put. But... how do I find out my chip type? And, in that table, RAM limit is intended as per slot or as the sum? Just another thing: when I buy my RAM, is it only necessary that I check if it is PC 5300? Does it matter the producer of the RAM for instance (except from a performance point of view)? Thanks!