39M5812 - IBM 4GB DDR2 SDRAM Memory Module 4 GB (2 x 2 GB) - 400 MHz DDR2-400/PC2-3200 - ECC - DDR2 SDRAM - 240-pin 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