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
Synology RAM DDR3L-1866 SO-DIMM 4GB (D3NS1866L-4G) 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