Samsung Original 16GB, (2 x 8GB) 240-pin DIMM, DDR3 PC3-12800, Desktop Memory Module at Amazon.com
256MB (2 x 128MB) PC66/100/133 168-PIN SDRAM DIMM Memory RAM KIT for iMac G3/G4, EMAC G4, POWERMAC G3/G4 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