HPE 64GB 2666MHz PC4-21300R ECC LRDIMM 815101-B21 Capacity: 64 GB DIMM Type: LRDIMM DIMM Capacity: 64 GB DIMM Rank: Quad DIMM Native Speed (MT/s): 2666 MT/s Technology: DDR4 SDRAM Form Factor: LRDIMM 288-Pin Speed: 2666 MHz (PC4-21300) Data Integrity Check: ECC Features: Quad Rank, Load-Reduced