How to Install RAM Memory into your Macbook
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I have been looking everywhere and I would love an answer if any one knows. Do you need to back up your computer before taking out the old memory cards (if there are memory cards in there that is.) OR Are there memory cards automatically added in to new computers? I've had my computer for 4 years and I don't want to lose any information by replacing/adding memory. So Is there anything I need to do first?

No need to backup your data. (every time the computer is turned off the data on the ram/memory is wiped.) You can go to a crucial.com to find the correct ram/memory.

I upgraded my Macbook with 2 x 2GB memory modules and now have a superfast 4GB Macbook - Everything working as it should.

i am wondering if you ever had any problems. i am looking to upgrade my macbook from 2g to 4g.. everything continue to run smoothly?