716324-B21 . Is a DDR3 Module. DDR3 Modules run from 1066 to 1600 MT/s (million transfers per second) This module has a total capacity of 24GB. The Bus Type is PC-10600. Registered ECC help prevent data corruption and maintain data integrity, usually used in servers. The data transfer rate for this specific part is 1333 Mhz.
726717-B21 . Is a DDR4 Module. DDR4 Modules run from 2133 to 3200 MT/s (million transfers per second). This is a 4GB module. The Bus Type is PC-17000. Its ECC (Error Correction Code) features prevent data corruption and system failure which is typically ideal for server machines. You can expect the data to transfer at a rate of 2133 Mhz.
726718-B21 . Is a DDR4 Module. DDR4 Modules run from 2133 to 3200 MT/s (million transfers per second). Has a total capacity of 8GB (Gigabytes). Has a Memory Bus Type of PC-17000. Registered ECC help prevent data corruption and maintain data integrity, usually used in servers. Has a data transfer rate of 2133 Mhz.
726719-B21 . Is a DDR4 Module. DDR4 Modules run from 2133 to 3200 MT/s (million transfers per second) This module has a total capacity of 16GB. Contains a PC-17000 Memory Bus Type. Registered ECC help prevent data corruption and maintain data integrity, usually used in servers. Has a data transfer rate of 2133 Mhz.
726720-B21 . Is a DDR4 Module. DDR4 Modules run from 2133 to 3200 MT/s (million transfers per second). This is a 16GB module. The Bus Type is PC-17000. Uses ECC (Error Correcting Code), ideal when system failure must be avoided at all costs. Is also registered which makes it stable enough for server conditions. Has a data transfer rate of 2133 Mhz.