726722-B21 . Is a DDR4 Module. DDR4 Modules run from 2133 to 3200 MT/s (million transfers per second) Has a total capacity of 32GB (Gigabytes). Has a Memory Bus Type of 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.
726724-B21 . Is a DDR4 Module. DDR4 Modules run from 2133 to 3200 MT/s (million transfers per second) This is a 64GB module. Contains a PC-17000 Memory Bus Type. Its ECC (Error Correction Code) features prevent data corruption and system failure which is typically ideal for server machines. Has a data transfer rate of 2133 Mhz.
HP SmartMemory is a unique technology introduced in HP ProLiant Gen8 Servers that unlocks certain features available only with HP Qualified Server memory in Gen9 servers also. HP SmartMemory enables ProLiant Gen9 systems to reliably identify and verify whether installed memory has passed the rigorous HP qualification and testing processes. And because the memory is authenticated, you can enable extended memory performance features through the system ROM.
731761-B21 . Is a DDR3 Module. DDR3 Modules run from 1066 to 1600 MT/s (million transfers per second). This is a 8GB module. The Bus Type is PC-14900. Registered ECC help prevent data corruption and maintain data integrity, usually used in servers. You can expect the data to transfer at a rate of 1866 Mhz.
731765-B21 . Is a DDR3 Module. DDR3 Modules run from 1066 to 1600 MT/s (million transfers per second). Has a total capacity of 8GB (Gigabytes). Contains a PC-12800 Memory Bus Type. Its ECC (Error Correction Code) features prevent data corruption and system failure which is typically ideal for server machines. Has a data transfer rate of 1600 Mhz.
759934-B21 . Is a DDR4 Module. DDR4 Modules run from 2133 to 3200 MT/s (million transfers per second). This is a 8GB module. Contains a PC-17000 Memory Bus Type. Its ECC (Error Correction Code) features prevent data corruption and system failure which is typically ideal for server machines. The data transfer rate for this specific part is 2133 Mhz.