Full Details on Amazon.com : http://www.amazon.com/gp/product/B004GNLIKS?tag=tsukuyomi-20
Memory Module 4GB 800MHz DDR2 (PC2-6400) - 2x2GB SO-DIMMs for Apple iMac Intel Core 2 Duo Early
Halogen Free ROHS
Speed PC2-6400 800MHz
Form Factor 200 pin SODIMM
Capacity 4GB 2 X 2GB Kit
Warranty Lifetime