crwdns2934241:0crwdne2934241:0 arbaman

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Key here is model A1278 that was manufactured from 2011 until late 2016. Any of those boards will fit your 2011 i7 Mac, but at this stage I’d recommend sticking to i5 or i7 mid 2012 or later as they’re Mac Os Mojave and if I understood right Catalina too next fall. Forget about any A1425 or A1502 from 2012/2013, they are retina Macbooks that are not compatible with yours.

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open