FUJITSU 4GB DDR2-667 PC2-5300 REG D ECC MEMORY OPTION S26361-F3283-L516

4GB DDR2-667 PC2-5300 REG ECC: This indicates the type and capacity of the memory module. It is a 4GB DDR2 (Double Data Rate 2) memory module with a speed of 667 megahertz (PC2-5300) and registered error-correcting code (ECC) support. ECC memory is capable of detecting and correcting certain types of data corruption that can occur during operation.