DDR4-3200 RAM modules must be installed, DIMM, not SO-DIMM. This one fits, RAM should always be installed in pairs, i.e. if there are two RAM modules and there are only 2 slots, replace both with larger RAM and keep the removed RAM for the warranty case.

Crucial Desktop Memory (2 x 16GB, 3200 MHz, DDR4-RAM, DIMM)