The DRHZ840 upgrades are registered memory modules, which conforms to JEDEC's DDR4, PC4-2133P standard. The 32GB option is a load - reduced memory module (LRDIMM). One 4K - bit EEPROM is used for Serial Presence Detect and a combination register/PLL, with Address and Command Parity is also used.
8GB DDR4 SDRAM Memory Module
