4GB [2x2GB] DDR2-667 (PC2-5300) RAM Memory Upgrade Kit for The Apple iMac 7,1 (20-inch, 2.0GHz, MA876LL/A) Intel Core 2 Duo (Genuine A-Tech Brand) at Amazon.com
Hynix DDR2 667MHz 4GB PC2-5300P ECC SERVER Registered Memory Module at Amazon.com
8GB 2 X 4GB DDR2 PC2-6400 800MHZ 240Pin AMD DIMM Hgih Density Desktop Memory at Amazon.com