Kingston KVR667D2Q8F5/4G PC2-5300 4GB DDR2 RAM 667MHz FB-DIMM 240-Pin Server RAM ECC Memory at Amazon.com
64GB Kit (8x8GB) Fully Buffered DDR2 Server Ram/Memory. PC2-5300 667MHz DDR2 DIMM ECC (Fully Buffered) 240 Pin 1.8V 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
2GB PC2-5300P Memory Kit 4X 512MB ECC DDR2 667 FB Server RAM Micron MT9HTF6472PY-667D2 at Amazon.com