Can I Switch 2 3Ghz 8Gb Ram Lb And Replace It With A 2 6 16Gb Ram Lb Macbook Pro 15 Retina Display Mid 2012

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A friend wants to replace the 8Gb RAM board for a 16GB Ram board, Are they similar enough in layout for me to order a 16gBRAM board same year and drop it into this carcass?

While you could do that, finding a board will be a bit of a hunt! The i7 2.6 GHz 16GB logic board for this system is one of the rarest boards as it was so desirable as an upgrade years ago. Keep in mind the cost $650! Consider looking for a used system which is newer! If you can find one get a 2015 model would be a good investment.