Memory Upgrade Compatibility for a Mid-2012 MacBook Pro 9,2

MOHAMMADSHASHAA wrote:

me too I'm in love with this machine I also replaced the HDD with an SSD thanks a lot for helping me I just thought intel cpu will pick up the fastest CAS timing again I'm so happy that you've replied to my question have a nice day man

Theoretically that should be possible, but I stopped that when Macs switched from PPC to Intel years ago as the others are absolutely correct on how picky Macs are regarding memory. Besides Apple has not published the CAS spec information.

Even when purchasing Crucial RAM, make sure to get the exact part numbers compatible with your Mac by using one of the two tools on the Crucial website. Buying memory based solely on technical specifications is no longer a guarantee of compatibility unfortunately. If you purchase Crucial memory from a third party vendor, then make sure the part numbers are compatible and the vendor is showing the memory as "Mac Compatible" or "For Mac", otherwise I suggest avoiding it.

The same holds true for buying memory for any system these days....make sure to use the tools on the memory vendor's website to identify compatible memory for a specific computer or Logic Board. Now, when looking over the specifications for multiple memory modules listed as compatible, then you can choose the fastest CAS from the list of compatible modules. FYI, usually a faster CAS mean one of the other specs will be slower (usually the RAS....aka Row strobe timing....CAS is Column strobe timing).

the memory controller in these Macs is inside the processor. it is completely inflexible.

If you install memory that is too slow, it will not work at all.

if you install memory that is faster, rather than getting a free speed upgrade, you get 3 to 5 mysterious crashes a week.

Use EXACTLY the correct memory, and if you are not a deep expert on this subject, but from a vendor IS an expert and says:

"it works in your Mac,

or your money Back."

I used to have the same model - great machine. I would only buy from Macsales. Stay away from Kingston. I also replaced the slow HD with an SSD.

https://eshop.macsales.com/shop/memory/Apple_MacBook_MacBook_Pro/Upgrade/DDR3_1600MHz_SDRAM

They also have great install videos.

https://eshop.macsales.com/installvideos/macbookpro-13-unibody-mid12/

Macs are very fussy about which RAM modules are used. most users here will only recommend getting your RAM from either OWC or Crucial, with most other manufacturers it is a craps shoot as to wether or not it will work.

Remember that this was/is the last model where you could replace things yourself.