Apple Memory Module 4GB 1066MHz DDR3 (PC3-8500) - 2x2GB SO-DIMMs 4GB DDR3 PC3-8500 1066MHz Kit of TWO 2GB modules 4GB Upgrade Compatible with Apple iMac, MacBook,MacBook Pro and Mac mini systems Equivalent to Apple P/N MC243G/A - 2 x 2GB SODIMM 204-Pin Modules Included for a total upgrade of 4GB Memory comes in standard, anti-static packaging Please verify the specifications of your Mac before ordering to avoid any conflicts