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Enter your serial nr here: https://everymac.com/ultimate-mac-lookup/ and it should tell you max ram. If not post your model here and someone will tell you.
More ram is always good, so is a SSD drive
if my mac (old old old 2009 macbook) is taking ages to switch between windows and open apps is this RAM related?
I can't afford a new mac but would putting more RAM in it help? It currently has the max 4gb in, but i read somewhere (maybe here) that the limits publicised by Apple could be taken with a pinch of salt...