I was hoping that two SODIMM's I pulled from my retired Lenovo x131e laptop would work in the OptiPlex 3020 Micro but I just get a beep code at boot. The 3020M already has 8GB of RAM (2x4GB) so I could just leave it alone. But I'm curious why these SODIMM's don't work? I think they're Low Density units if that's the issue ...?

Crucial CT2KIT102464BF160B
2 x 8GB CT102464BF160B
DDR3/DDR3L 1600 MT/S (PC3-12800) 1.35v
Unbuffered SODIMM 204-Pin Memory