4.0GB PC6400 DDR2 800MHz 200 Pin Memory Upgrade Module CL6, Dual Rank, Non ECC, 1.8V Memory Upgrade for MacBook, iMac and PC Memory Upgrade For MacBook (Model ID: MacBook5,2), 24-inch Apple iMac Intel (Model ID: iMac8,1), 20-inch Apple iMac Intel (Model ID: iMac8,1), and PC Laptops with Intel / AMD OWC Memory Lifetime Limited Warranty including Advanced Replacement Program