8GB 2 X 4GB DDR2 PC2-6400 800MHZ 240Pin AMD DIMM Hgih Density Desktop Memory 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