A-Tech 8GB Kit (4 x 2GB) DDR2 800MHz PC2-6400 Non-ECC DIMM for HP Compaq DC Series Desktop dc5800 dc5850 - RAM Memory Modules at Amazon.com
MemoryMasters 8GB (2x4GB) DDR2-800 PC2-6400 240-pin DIMM Memory RAM Dual Rank Non-Ecc Unbuffered for Desktop PC Computer 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