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I have a 15 inch macbook pro (mid 2009 1.8ghz core 2 duo) and I want to upgrade the memory. It currently has 4gb (2x2gb) and the maximum Apples says will work is 8gb. I am wondering if I could get away with 16gb (2x8gb). I know this is possible on certain other macbooks, I am just wondering if it will work on my model.