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Early 2011 Model: A1278 / 2.3 GHz i5 or 2.7 GHz i7 processor

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Changed to 16GB but not recognized in About MAC


I just put in 16GB on my macbook pro 13 inch early 2011 and "About MAC" only shows 8GB with one slot open. I am on high sierra. Does About MAC not recognize more than 8GB or do I need to check that both memory cards are installed accurately?

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Check which slot is being seen, then switch the sticks to see if it is the stick or the slot.

What OS X are you running?

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1 Comment:

That fixed it, now both slots are recognized and showing 16 GB. BTW I am on High Sierra 10.13.6.

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jakerekes will be eternally grateful.
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