4GB DDR2-667 (PC2-5300) Memory RAM Upgrade for The System X 3600 Series 3650 (7979E9U) Server Memory at Amazon.com
Nanya NT2GT64U8HD0BY-AD 4GB 2 x 2GB PC2-6400U DDR2 800 NonECC Desktop Memory Kit 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
IBM 12R9574 4496 8/16GB (4x 4GB) 276-Pin 533MHz CUoD DDR2 SDRAM DIMMs pSeries  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