"What is the maximum RAM for a MacBook Unibody A1342?"に関する回答The ram has to be pc3 ddr sodimm with a maximum of 1066mhz. From what I'm seeing though, if it has 1066 mhz you can also install 4gb on each row. I just upgraded my customer's computer from 2gb to 4gb but the ram was the 1066mhz speed. It looks like jotastrong, you're trying to install too fast of a mhz for that computer most likely.