AddOn 16GB DDR4 SDRAM Memory Module - 16 GB (1 x 16GB) - DDR4-2666/PC4-21333 DDR4 SDRAM - 2666 MHz - CL19 - 1.20 V - ECC - Unbuffered - 288-pin - DIMM - Lifetime Warranty

HP® 3TQ40AT Compatible Factory Original 16GB DDR4-2666MHz Unbuffered ECC Dual Rank x8 1.2V 288-pin CL19 UDIMM