Komputerbay 8 GB (2 x 4GB) PC2-6400 DDR2-800 SoDIMM Dual Channel Laptop Memory Kit at Amazon.com
DDR2 2x2GB (4GB Kit) 800MHz UDIMM RAM (PC2-6400) CL6 240Pin 1.8V Non-ECC Unbuffered Compatible All Motherboards 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