Hi all, Sorry I'm not much of a computer guy so I'm looking for some advice for a possible ram upgrade. I have a 2.53 ghz, 4 gb memory, Version 10.7.4 macbook pro from I believe the summer 2009 family (as referred on apple's website). I love my computer but have become frustrated with its declining performance, particularly when running multiple apps. Again i'm not a computer guy, but my guess is that over the last few years my increased number of files in my iTunes (currently about 50 gigs) has put a strain on the memory, making it difficult to run iTunes and other apps. Does someone have a suggestion for possibly upgrading ram on my laptop? Apple has two options listed for my computer's generation, 4 gb and 8 gb, at $100 and $200 respectively. Do these options mean you upgrade TO 4 gb or TO 8 gb, meaning I would have to buy the 8 gb since I already have 4 gb? Or does someone know a cheaper,reliable place to upgrade instead of with apple? Thanks!