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
LEVEN DDR2 4GB (4GBx1) 667MHz PC5300 Unbuffered Non-ECC UDIMM 240 Pin PC Computer Desktop Memory Module Ram Upgrade- (JR2U667172208-4M) at Amazon.com