Mac mini Late 2018 Teardown https://d3nevzfk7ii3be.cloudfront.net/igi/oXmAj2mKf4sCNESP.large#.jpg
With the board out, we're going straight for the RAM. Apple has trapped it in a heavy metal cage―almost as if they don't fully trust modular RAM to behave itself.
We pop out two SKhynix HMA851S6CJR6N 4 GB DDR4-2666 SDRAM modules, each with four 1 GB H5AN8G6NCJR DDR4 SDRAM ICs.