Kingston KTH-XW4300/1G DDR2 SDRAM PC2-5300 (DDR2-667) 1GB 667mhz 240 Pin 1.8V RAM Made for HP XW4300 - Walmart.com
Kingston 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Dual Channel Kit System Specific Memory Model KTH-XW9400K2/2G System Specific Memory - Newegg.com
Crucial 2GB Single DDR2 667MHz (PC2-5300) CL5 SODIMM 200-Pin Notebook Memory Module CT25664AC667 at Amazon.com
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,