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hi i have an a1398 late 2012 8gb ram 2.6ghz, m975LLA do you know what the part number will be for the 16gb ram model?

I’m confused on exactly which machine you have. The m975LL/A is a Apple MacBook Pro “Core i7” 2.3 15" Retina 2012 The m976LL/A is a Apple MacBook Pro “Core i7” 2.6 15" Retina 2012 the RAM doesn’t help: Standard RAM: 8 GB Maximum RAM: 16 GB* Details:*8 GB of RAM is onboard. It originally could be upgraded at the time of purchase to 16 GB as a US$200 option, but it cannot be upgraded subsequently.