CMS 512MB DDR SDRAM Memory Module - 512 MB (2 x 256 MB) - DDR SDRAM - 333 MHz DDR333/PC2700 - Non-ECC - Unbuffered - 184-pin DIMM CMS 512MB DDR SDRAM Memory Module - 512 MB (2 x 256 MB) - DDR SDRAM - 333 MHz DDR333/PC2700 - Non-ECC - Unbuffered - 184-pin DIMM