HP 4 GB DDR3 SDRAM Memory Module - 4 GB (1 x 4 GB) - 1333MHz DDR3-1333/PC3-10600 - DDR3 SDRAM - 240-pin DIMM at Amazon.com
416258-001 Genuine 416258-001 4GB, Registered DDR SDRAM DIMM, PC2700, (1 x 4GB) at at Amazon.com
HYNIX - IMSOURCING SK 4GB DDR3 SDRAM Memory Module - for Desktop PC, Workstation - 4 GB - DDR3-1600/PC3L-12800 DDR3 SDRAM - 1600 MHz - CL11-1.35 V - Non-ECC - Unbuffered - 240-pin - DIMM 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