Max Memory/RAM for MacBookPro9,2

MacBookPro9,2 (mid-2012, A1278, EMC 2554)

I put in a single 8GB DDR3L chip, but the laptop just beeps; and to prove low voltage okay (because who doesn't want a chance at longer battery life?!), I dropped in two 4GB DDR3L and it was fine. Just my experience: the 4GB chip max (and two slots makes 8GB total max) was true as advertised (https://support.apple.com/en-us/HT201165).

Unsure if there's a specific model of a memory chip that will allow us to use 8GB chips (like OWC is advertising: https://eshop.macsales.com/upgrades/macbook-pro-13-inch-mid-2012-2.5-ghz/memory), but I used Hynix brand (because that's what Apple uses), and it didn't work. It's an old machine (and just as old of a post!), and 8GB total with an SSD makes it feel okay.

Your Mid 2012 MacBook Pro supports 8 GB of RAM officially. However, Early 2011 and newer MacBooks Pro can use 16 GB of RAM without any problem, so if you want, you can install 16 GB of RAM. You can buy RAM at OWC or Crucial.

There are users that have installed 16 GB of RAM in this forum. Look for their posts.

I used 16GB of RAM on a Macbook Pro Late 2011 for over a year with no issues. Purchased from Crucial. Refer to mende1's post.

It will not be a problem, and your MacBook will use all the memory. Here you have the steps to install more memory > http://support.apple.com/kb/HT1270?viewlocale=en_US&locale=en_US

You are welcome

Reading customer reviews, the company seems reputable- it make quality RAM which are compatible with Macs and tested beforehand. This is important because Macs are picky when it comes to RAM. As long as the RAM comes with warranty, I don't see why there would be an issue.