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This Apple support article, MacBook Pro: How to remove or install memory, says that the maximum memory on a MacBook Pro 13-inch is 8 GB. Is that a hard limit? Why could I not install a 16 GB memory stick in there? Would it work, but only for the first 8 GB? Is there any way around the limit?

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Can you be more precise, which Macbook pro 13" are you talking about ? –  Matthieu Riegler Sep 18 '13 at 11:41

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up vote 2 down vote accepted

To pick a random 13" MBP, such as this one from mid 2012:

http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i5-2.5-13-mid-2012-unibody-usb3-specs.html

The 8Gb limit seems to be an Apple supported limit, but many people happily report getting 16Gb working fine - see the memory section in the link as well as this page for details.

The "Mid-2009" and "Mid-2010" MacBook Pro models support 1066 MHz PC3-8500 DDR3 SO-DIMMs and officially and unofficially support a maximum of 8 GB of RAM with one odd exception.

Specifically, as discovered by OWC, the 13-Inch "Mid-2010" MacBook Pro models (and only the 13-Inch models) -- the MacBook Pro "Core 2 Duo" 2.4 13" Mid-2010 and "Core 2 Duo" 2.66 13" Mid-2010 identified by MacBookPro7,1 -- can support up to 16 GB of RAM with dual 8 GB memory modules if they are running OS X 10.7.5 or higher, have been updated to use the latest EFI, and are equipped with proper specification memory modules. If running a version of Mac OS X 10.6 "Snow Leopard," these models only can use 8 GB of RAM.

The "Early 2011" and "Late 2011" MacBook Pro models use faster 1333 MHz PC3-10600 DDR3 SO-DIMMs. They officially support 8 GB of RAM, but OWC has determined that they actually support 16 GB of RAM regardless of the operating system installed, although only the "Early 2011" MacBook Pro models are capable of running a version of Mac OS X 10.6 "Snow Leopard."

Finally, the "Mid-2012" non-Retina Display MacBook Pro models use faster still 1600 MHz PC3-12800 DDR3 SO-DIMMs and likewise officially support 8 GB of RAM, but actually can support as much as 16 GB of RAM. These models do not run versions of OS X prior to OS X 10.7 "Lion."

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I checked my model, which is MacBook Pro (13-inch, Mid 2010) identified by MacBookPro7,1 and I have OS X 10.8.2 - so I should be able to install 2 x 8 GB RAM right? How can I know if the RAM is proper specification? How can I know if latest EFI is in place? –  Billy Moon Sep 18 '13 at 12:20
    
You are in luck then :) Read through this page - covers it all blog.macsales.com/… If you are in the US, then use these guys. –  stuffe Sep 18 '13 at 12:27
    
I am in Ireland, but still placed my order with the guys you linked to choosing $7~ shipping (there was $3~ available too). Thanks for the help! –  Billy Moon Sep 18 '13 at 12:40
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For posterity, my 16 GB RAM (two sticks of 8) works perfectly :) –  Billy Moon Dec 22 '13 at 12:31

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