I own a Macbook from 2007 with 2.16GHz. 2GB time I had let me install on the purchase and I came a long handle it. However, I had the feeling that I get my book lately faster to its performance limits. As I have already had good experience with Kingston in the PC area, I decided to back it.
Although managed the old Macbook only 3GB will (recognize 4GB) everything runs much smoother - even if many windows are on or programs are started.