Kingston ValueRAM 4GB DDR4 SDRAM Memory Module - 4 GB - DDR4-2666/PC4-21300 DDR4 SDRAM - 2666 MHz - CL19 - 1.20 V - Non-ECC - Unbuffered - 288-pin - D
Amazon
Kingston KVR26N19S6/4 ValueRAM - DDR4-4 GB - DIMM 288-Pin - 2666 MHz / PC4-21300 - CL19-1.2 V - Unbuffered - Non-ECC
STARMICRO INC.
Kingston 4GB DDR4 2666MHz PC4-21300 non-ECC Unbuffered 288-Pin DIMM OEM Desktop Memory KVR26N19S6/4