MacBook Pro mid 2012 I was always under the impression the memory wasn't able to be upgraded but here it says yes. I don't know what the first line means: ECC
This is a non Retina Display model.
The 13" and 15" yes up to 16GB, but not the Retina which comes with either 8/16GB soldered in. As you have 2x2GB yours is not a Retina model and with only two memory slots on your MBP, you would need to buy 2x4GB or 2x8GB, or 1x8GB and 1 x 4GB. OIWC recommended here:-
Thanks for the quick response and the link. I've done business with Other World Computing before and had a good experience both times. I'll order two 8GB now.
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