HPE SAS Drives Registered Smart Memory Kit (815100-B21), Capacity: 32GB (1x32GB), Memory Speed: 2666MHz, Memory Standard: DDR4-2666, Signal Processing: Registered, Form Factor: 288-pin DIMM, Error Checking: ECC. HP DDR4 SmartMemory delivers on great performance, reliability, and efficiency. Our large selection of server memory solutions provides the compatibility, capacity and bandwidth you need to productively manage your expanding workload.