This is 256GB (8x32GB) PC4-17000P-L 2133MHz DDR4 ECC Load Reduced Registered Memory Kit For HP ProLiant DL380 G9 Gen9 ServerThe system's memory specification:HPE SmartMemory DDR4 Registered (RDIMM) or Load Reduced (LRDIMM)DIMM Slots Available 24 (12 DIMM slots per processor, 4 channels per processor, 3 DIMMs per channel)Maximum Capacity (LRDIMM) 3TB (24 x 128GB LRDIMM)Maximum Capacity (RDIMM) 768GB (24 x 32GB RDIMM)Maximum Capacity (NVDIMM) 128GB (16 x 8GB NVDIMM)NVDIMM support only with the E5-2600v4 processors, and RDIMMs only 128GB DIMMS cannot be mixed with any other size DIMMs. NVDIMMs cannot be used with LRDIMMs. A maximum of 16 NVDIMMs can be supported. NVDIMMs are only supported on factory configured servers with E5-2600 v4 processors, not supported on servers upgraded from E5-2600 v3 to E5-2600 v4 processors.Dot not mix LRDIMM Memory with RDIMM Memory on the same motherboard