The DRHZ2666R upgrades are registered memory modules, which conform to JEDEC's DDR4, PC4-2666V standard. The DRHZ2666LR is a load-reduced memory module (LRDIMM). One EEPROM is used for Serial Presence Detect and a combination register/PLL, with Address and Command Parity is also used.- 288-pin JEDEC-compliant DIMMs- 133.35 mm wide by 31.25 mm high (5.25” x 1.23”)- Data Transfer Rate: 21.3 Gigabytes/sec- Operating Voltage: 1.2V (1.14V~1.26V)- Fully RoHS Compliant- Thermal Sensor