A-Tech for Apple 4GB Module PC3-10600 Mac Mini iMac MacBook Pro Mid 2010 Late 2011 A1286 MD311LL/A A1297 MC511LL/A A1312 MC309LL/A A1311 MC812LL/A MC813LL/A MC814LL/A MC815LL/A A1347 Memory RAM at Amazon.com
Kingston 4 GB Apple SODIMM iMac and MacBook Memory (Kit of 2) KTA-MB800K2/4G at Amazon.com
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Kingston Technology 8GB Kit (2x4 GB Modules) 1066MHz DDR3 SODIMM Notebook Memory for Select Apple iMac's and Macbooks KTA-MB1066K2/8G at Amazon.com
Kingston 4 GB Apple SODIMM iMac and MacBook Memory (Kit of 2) KTA-MB800K2/4G at Amazon.com