Memory Tester for DDR4, DDR3, DDR2, DDR, DIMM LRDIMM server memory and SO-DIMM - RAMCHECK
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
Best DDR4 RAM: Fastest memory for your AMD PC or Intel | Trusted Reviews