Crucial 4GB DDR4 SDRAM Memory Module - 4 GB - DDR4-2666/PC4-21300 DDR4 SDRAM - CL19-1.20 V - Non-ECC..

Crucial 4GB DDR4 SDRAM Memory Module – 4 GB – DDR4-2666/PC4-21300 DDR4 SDRAM – CL19-1.20 V – Non-ECC – Unbuffered – 288-pin – DIMM