Crucial 8 GB DDR4 PC4-17000 Unbuffered NON-ECC 1.2 V - 8 GB - DDR4 SDRAM - 2133 MHz DDR4-2133/PC4-17000 - 1.20 V - Non-ECC - Unbuffered UNBUFFERED DIMM 288 PIN 8 GB DDR4 2133 MT/s CL15 DR X8 unbuffered DIMM 288 PIN.