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
2GB PC2-5300P Memory Kit 4X 512MB ECC DDR2 667 FB Server RAM Micron MT9HTF6472PY-667D2 at Amazon.com
Komputerbay 8GB (4X 2GB) DDR2 PC2-5300F 667MHz CL5 ECC Fully Buffered 2Rx4 FB-DIMM (240 PIN) w/Heatspreaders (This is Used mainly in Servers - Will not Work with Non ECC UnBuffered) at Amazon.com