https://uk.crucial.com/compatible-upgrade-for/dell/optiplex-3070-micro

https://uk.crucial.com/memory/ddr4/ct16g4sfd832a/ct15136697

DDR4 PC4-25600 • CL=22 • Dual Ranked • x8 based • Unbuffered • NON-ECC • DDR4-3200 • 1.2V • 2048Meg x 64 •