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Apple MacBook Pro: RAM upgrade (HowTo)
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macbook pro - Can I upgrade RAM on late 2013 retina Mac Book Pro? - Ask Different
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The Super MacBook Pro Upgrade (1TB RAID SSD Upgrade + RAM Upgrade 2013) - YouTube
Apple MacBook Pro with Retina Display (15-inch, 2014) review: Still the best higher-res laptop, but the competition is catching up - CNET