Crucial Memory Bundle Including 64GB (2 x 32GB) DDR4 PC4-21300 2666MHz Registered Server Memory Technical Specifications Part Number Per DIMM: CT32G4RFD4266 Memory Included: 64GB (2 x 32GB) Technology: DDR4 Memory Specification Compliance: PC4-21300 Memory Speed: 2666MHz Buffered or Registered: Registered Form Factor: RDIMM Memory Technology: DDR4 Type: Server Memory Not Compatible for Desktops