Raspberry Pi 4 Computer Model B 8GB Single Board Computer Suitable for Building Mini PC/Smart Robot/Game Console/Workstation/Media Center/Etc. : Electronics - Amazon.com
Synology SODIMM ECC RAM DDR4 4GB (D4ES01-4G) at Amazon.com
Synology UDIMM ECC RAM DDR4-2666 16GB (D4EC-2666-16G) at Amazon.com
Crucial RAM 32GB Kit (2x16GB) DDR4 3200MHz CL22 (or 2933MHz or 2666MHz) Desktop Memory CT2K16G4DFRA32A at Amazon.com
Synology RAM DDR4 ECC SO-DIMM 8GB (D4ES01-8G) at Amazon.com