Review on A-Tech 2GB DDR3 1066MHz PC3-8500 SODIMM Memory RAM Module for Apple MacBook, MacBook Pro, iMac, Mac Mini - (Late 2008, Early 2009, Mid 2009, Late 2009, Mid 2010) Models by David Pearson

I ordered the same product twice. The first memory I ordered matched Apple's factory installed memory perfectly. The second had the same packaging but the features didn't match. It had 4 memory partitions instead of 2. It fit in the computer and since it said so on the box I installed it, theoretically doubling my MacBook's memory from 2g to 4g. My computer is now frozen. I've downloaded several apps that help me clear and control my memory, so I honestly don't know if the memory product I ordered had anything to do with my current issue or not. I was confused that the 2 items ordered did not have the same appearance.