The DRH92133R upgrades are registered memory modules, which conforms to JEDEC's DDR4, PC4-2133P standard. The DRH92133LRQ 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.
32GB DDR4 SDRAM Memory Module