Crucial 4GB DDR2-667MHz (PC2-5300) CL5 ECC RDIMM DR 240-pin Server Memory CT51272AB667 at Amazon.com
Zopsc DDR2 4GB RAM 800MHz Memory Module for AMD CPU Stable Fast Data Transmission 240PIN for High Anti-Interference and Antistatic for Desktop Computer, Plug and Play at Amazon.com
SIMPLETECH 90000-40625-001U PC2-3200R DDR2 400 4GB ECC REG CL3 (FOR SERVER ONLY) at Amazon.com