The DRH2933R upgrades are registered memory modules and the DRH2933LR upgrades are loadreduced memory modules, which conform to JEDEC's DDR4-2933, PC4-2933Y standard. The DRH2933LR is a load-reduced DIMM. One EEPROM is used for Serial Presence Detect and a combination register/PLL, with Address and Command Parity is also used.
128GB DDR4 SDRAM Memory Module