RAM upgrade from current (2) 4 GB each
I have 2 memory slots each with a 4 GB module. Can I upgrade?
Is this a good question?
Released June 2012 / Core i7 processor with Turbo Boost / Up to 1 GB DDR5 Video RAM
The non-retina models can be upgraded up to 16 GB!
You can replace one module or both as an example replacing one you could get to 12 GB (one 4 GB & one 8GB module) or swap out both to get to 16 GB. But before you make this jump make sure its going to improve performance. Often upgrading the HD to a SSHD or SSD will get you more performance bang for most.
Here's the Apple T/N which goes over the details: MacBook Pro: How to remove or install memory
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