A-Tech For Apple 4GB Kit 2 x 2GB PC2-6400 800MHz iMac MacBook Mid 2009 Early 2008 MC240LL/A A1181 MB323LL/A A1224 MB324LL/A MB325LL/A A1225 MB398LL/A Memory RAM 4GB Kit 2x 2GB (2 x 2GB) SO-DIMM DDR2 NON-ECC PC2-6400 800MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For iMac, MacBook Models:Early 2008 Mid-2009 MB323LL/A MB324LL/A MB325LL/A MB398LL/A MC240LL/A A1181 A1224 A1225 iMac8,1 MacBook5,2