Based on this product's specifications, here are some alternatives and similar models
Memory module DDR3 4GB 1066MHz ECC for PC/Server — Dell G484D, 1×4GB, green
Summary description:
Dell 4GB DDR3 1066MHz ECC memory module (1×4 GB) for PCs and servers. Single internal DIMM module with DDR3 technology, 1066 MHz clock speed and error-correcting code (ECC) support. Designed to expand or replace system RAM in compatible desktops and servers, improving stability for virtualization, databases and mission-critical applications.