HP 8GB DDR4 SDRAM Memory Module - 8 GB - DDR4 SDRAM - 2666 MHz DDR4-2666/PC4-21333 - ECC at Amazon.com
Amazon.com: v-Color DDR4 8GB (8GBx1) 2666MHz (PC4-21300) CL19 Standard Desktop Computer PC Ram Memory Module Non ECC Unbuffered DIMM 1.2V(TD48G26S819-VC) : Electronics
HyperX Fury 8GB 2400MHz DDR4 CL15 DIMM 1Rx8 RGB XMP Desktop Memory Single Stick HX424C15FB3A/8 at Amazon.com
G.Skill Trident Z RGB Series 16GB (2 x 8GB) 288-Pin SDRAM (PC4-25600) DDR4 3200 CL16-18-18-38 1.35V Dual Channel Desktop Memory Model F4-3200C16D-16GTZR at Amazon.com