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
Komputerbay 8 GB (2 x 4GB) PC2-6400 DDR2-800 SoDIMM Dual Channel Laptop Memory Kit at Amazon.com
A-Tech 8GB (2x4GB) ECC RAM for HP Compaq ProLiant DL165 G5, DL165 G6, DL185 G5, DL385 G5p | DDR2 800MHz ECC RDIMM PC2-6400 2rx4 Registered DIMM Server Memory Kit at Amazon.com
Crucial 4GB Single DDR2 800MHz (PC2-6400) CL6 SODIMM 200-Pin Notebook Memory Module CT51264AC800 at Amazon.com