Kingston ValueRAM 4GB 667MHz DDR2 ECC CL5 DIMM (Kit of 2) Desktop Memory 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 ProLiant xw460c Blade Workstation (PARTS-QUICK BRAND). Equivalent to HP Part Numbers:
ACP - Memory Upgrades 8GB DDR2 SDRAM Memory Module - 8GB (2 x 4GB) - 667MHz E at Amazon.com