HPE 16GB (1x16GB) Single Rank x4 DDR4-2666 CAS-19-19-19 Registered Smart Memory Kit - 16 GB (1 x 16 GB) - DDR4-2666/PC4-21300 DDR4 SDRAM - CL19 - 1.20 V - ECC - Registered - 288-pin - DIMM