How to upgrade RAM in your 13" Apple Macbook - YouTube
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OWC 4GB PC5300 DDR2 667MHz SO-DIMM Memory RAM Upgrade Compatible with MacBook (Late 2007/Early 2008), MacBook Pro (Mid/Late 2007, Early 2008), & iMac (Late 2007) with Core 2 Duo CPU (OWC5300DDR2S4GB) at Amazon.com
Apple MacBook Pro 15-inch Late 2008 - 2.8GHz Core 2 Duo Laptop Memory & SSD Upgrades
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Upgrading RAM on a First Generation MacBook Air - YouTube