Adding 4GB RAM to 2007 MacBook

Suggest you download and run the Crucial OS X Scanner on your MacBook. It will show you what is possible and the correct memory to order for your system.

No the model 1,1 (Early 2006) can only use 2gb of 667mhz PC2-5300 RAM.

These are good online stores for Mac compatible RAM

OWC http://eshop.macsales.com/shop/memory/MacBook/DDR2/ - They offer Mac tested RAM at very good prices.

Crucial Memory http://www.crucial.com/ - good place to buy RAM from all over the world. They also have an excellent memory selector that allows you to choose memory based on your computer's model

Data Memory Systems http://www.datamemorysystems.com/apple-memory.asp - another good, cheap place to buying RAM if you live in the U.S.

Here are instructions on replacing RAM in a MacBook with a removable battery. http://homeoffice.consumerelectronicsnet.com/articles/viewarticle.jsp?id=44404