8Gb (2 x 4Gb) DDR3 Memory upgrade for Apple iMac 27" i5 2.7Ghz A1312 Mid 2011 RAM: Amazon.co.uk: Computers & Accessories
A-Tech for Apple 8GB Kit 2 x 4GB 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