Kingston KVR667D2Q8F5/4G PC2-5300 4GB DDR2 RAM 667MHz FB-DIMM 240-Pin Server RAM ECC Memory at Amazon.com
HyperX KHX8500AD2K2/4GR 4GB 1066MHz DDR2 Non-ECC CL7 (7-7-7-20) DIMM Kit of 2 - Retail at Amazon.com
Bewinner Memory RAM DDR2 4GB, 4GB Large Capacity DDR2 800Mhz Memory Module,Designed for AMD,Adopting 240Pin to Achieve High Anti-Interference and Antistatic Properties,Plug and Play at Amazon.com