4GB 2 X 2GB PC2-5300F 667MHz 240 pin DDR2 SDRAM ECC Fully Buffered FB DIMM Server Low Power Memory for HP Workstation XW8600 (PARTS-QUICK BRAND). Equivalent to HP Part Numbers: 397413-B21, 442823-B21,
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
HP 8GB DDR2 SDRAM Memory Module - 8 GB (2 x 4 GB) - 800 MHz DDR2-800/PC2-6400 - DDR2 SDRAM - 240-pin DIMM (HP SERVER MEMORY) at Amazon.com
Crucial 4GB Single DDR2 667MHz (PC2-5300) CL5 SODIMM 200-Pin Notebook Memory Module CT51264AC667 at Amazon.com
Corsair VS4GSDS800D2 Corsair Value Select 4GB DDR2 SDRAM Memory Module at Amazon.com