Dell DDR4 16 GB SO DIMM 260 Pin 2666 MHz / PC4-21300 1.2 V Unbuffered Memory Non-ECC Upgrade for Inspiron 3195 2-in-1, 3493, 54XX, 7790, OptiPlex 30XX, 5260, 70XX, 7460 at Amazon.com
Kingston 16GB ECC REG DR DDR4 2666MHZ (KTD-PE426D8/16G) at Amazon.com
SK HYNIX 16GB 2RX8 DDR4 SO-DIMM PC4-21300 2666MHZ Memory Module HMA82GS6JJR8N-VK at Amazon.com
v-Color 32GB (2 x 16GB) ECC SO-DIMM DDR4 2666MHz (PC4-21300) for NAS Micro Server/Workstation/Compatible with Synology 21 Series 2Rx8 CL19 1.2V (TES416G26D819K-VKC) at Amazon.com
PNY Performance 16GB DDR4 DRAM 2666MHz (PC4-21300) CL19 (Compatible with 2400MHz or 2133MHz) 1.2V Notebook/Laptop (SODIMM) Computer Memory RAM – MN16GSD42666 at Amazon.com
CORSAIR VENGEANCE RGB PRO 16GB (2x8GB) DDR4 2666MHz C16 LED Desktop Memory - Black at Amazon.com
OWC 32GB (2 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory, Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs, (OWC2666DDR4S32P) at Amazon.com