Patriot Signature Apple 8 GB (2 X 4 GB) PC3-8500 (1066 MHz) DDR3 MacBook and iMac SO-DIMM Memory Kit PSA38G1066SK PC3-8500 (1066MHz) Data Rate 204-Pin Dual in-line memory module 8GB (2 x 4GB) Non-ECC Unbuffered SODIMM Kit 100% tested for iMac, MacBook, MacBook Pro systems Lifetime Warranty