RAM compatibility between MacBook Pros

Question

I was hoping someone could help me determine if the original RAM from my mid-2012 13" MacBook Pro could be put into my mid-2009 13" MacBook Pro?

here are the specs of the original RAM

There's a great free app on the Mac App Store called EveryMac that is great for looking up specs about Apple products, even down to the RAM specs for each individual model. — RedEagle2000, Commented Dec 1, 2015 at 23:05

Anthony R · Accepted Answer · 2015-12-01 16:03:42Z

1

Here are the specs for the mid 2009 13" MacBook Pro:

And the mid 2012 13" MacBook Pro:

It'll work, it's slightly faster than the RAM it came with.

answered Dec 1, 2015 at 16:03

Anthony R

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The newer RAM is faster as a specification however that doesn't mean it will run at the faster speed in the older computer if its FSB can't handle the increased speed specification.
– user3439894
Commented Dec 1, 2015 at 16:36
Correct, but it'll work even if the FSB doesn't support the full speed. It'll just perform at the max speed supported.
– Anthony R
Commented Dec 1, 2015 at 17:17
Yes it will work however I made that statement in response to you saying "It'll work, it's slightly faster than the RAM it came with." because as written it might lead one to think it will be as fast in the old system. The FSB is 1066 MHz on the old system so the 1600 MHz RAM will only run at 1066 MHz on the old system.
– user3439894
Commented Dec 1, 2015 at 18:27

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