Hynix HYMP125U64CP8-Y5 4GB 2 x 2GB PC2-5300U DDR2 667 Non-ECC Unbuff Memory Kit at Amazon.com
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