CMS 2GB DDR2 SDRAM Memory Module - 2 GB (2 x 1 GB) - DDR2 SDRAM - 533 MHz DDR2-533/PC2-4200 - Non-ECC - Unregistered - 240-pin DIMM CMS 2GB DDR2 SDRAM Memory Module - 2 GB (2 x 1 GB) - DDR2 SDRAM - 533 MHz DDR2-533/PC2-4200 - Non-ECC - Unregistered - 240-pin DIMM