These memory cards: 8GB Memory - Dual Channel Kit SAMSUNG original 2 x 4 GB DDR3-1066 PC3-8500 204-pin SO-DIMM (2x M471B5273BH1-CF8) Laptop DDR3 computer memory Apple MacBook + MacBook Pro + + + iMac Mac Mini (2009 / 2010) (Bought 18 September 2012) fully match my expectations, excellent packaging, missed deadline, setting up easy and trouble free operation. Good description for the choice of purchase.