HP 8GB DDR2 SDRAM Memory Module ECC - 8GB (2 x 4GB) - 667MHz DDR2-667/PC2-5300 - DDR2 SDRAM - 240-pin at Amazon.com
CMS 8GB (2X4GB) DDR2 5300 667MHZ ECC Fully BUFFERED DIMM Memory Ram Compatible with HP/Compaq Workstation Xw8600 Series Ddr2-Pc5300 Fb for Server Only - B54 at Amazon.com
16GB Kit [2x8GB] DDR2-667 (FB-DIMM) Memory RAM Upgrade for The Compaq HP Proliant ProLiant DL360 G5 Server Memory at Amazon.com