This is a 2GB Ram upgrade for the Macbook and Macbook Pro Core 2 Duo models. THIS IS A SINGLE CHIP, NOT TWO CHIPS. Specs: 2GB DDR2 PC5300 SODIMM.

CORE 2 DUO Model Compatibility:

Can address up to 4GB:

2.2 GHz MacBook Pro 15"
2.4 GHz MacBook Pro 15"
2.6 GHz MacBook Pro 15"
2.4 GHz MacBook Pro 17"
2.6 GHz MacBook Pro 17"

Can address up to 3GB:

2.16GHz MacBook Pro 15"
2.33GHz MacBook Pro 15"
2.33GHz MacBook Pro 17"

1.83GHz MacBook 13.3"
2.0GHz MacBook 13.3"
2.16GHz Macbook 13.3"