according to various sources, including [http://www.everymac.com/systems/apple/macbook/macbook-unibody-faq/macbook-macbook-pro-unibody-how-to-upgrade-ram.html|this one], and also [http://mactracker.dreamhosters.com/|Mactracker], you can install up to 6GB of RAM in the MacBook Unibody A1278 (aka MacBook Late 2008)
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according to various sources, including [http://www.everymac.com/systems/apple/macbook/macbook-unibody-faq/macbook-macbook-pro-unibody-how-to-upgrade-ram.html|this one], and also [http://mactracker.dreamhosters.com/|Mactracker], you CAN install up to 6GB of RAM in the MacBook Unibody A1278 (aka MacBook Late 2008)
the same source mentioned above also mentions that real-world testing shows an almost negligible performance difference running match RAM modules vs running 2GB + 4GB
according to various sources, including [http://www.everymac.com/systems/apple/macbook/macbook-unibody-faq/macbook-macbook-pro-unibody-how-to-upgrade-ram.html|this one], and also [http://mactracker.dreamhosters.com/|Mactracker], you can install up to 6GB of RAM in the MacBook Unibody A1278 (aka MacBook Late 2008)
the same source mentioned above also mentions that real-world testing shows an almost negligible performance difference running match RAM modules vs running 2GB + 4GB