My mom has a non retina MacBook Pro 2012 and it currently has 4GB of ram and a 500GB HDD. I have purchased an SSD for her, and I'd also like to increase the RAM to 8. I'm not sure which type of RAM I should buy, and I'm also wondering if I have to buy 8GB's of RAM, or can I just buy 4GB and add it to the existing RAM stick. Any insight is greatly appreciated.
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