Difference between DIMM and SIMM in memory slots?

So maybe it's not A+AB+B Either way, if I don't get to put both of my memory into the yellow slots (A1 slot is the most impacted one from the

DDR5 SO-DIMM Socket status based on JEDEC standard, and DDR5 vs DDR4 full spec comparison

sonic 3 air extra slot , looks very similar to a DDR3 DIMM DDR4 is not backward-compatible with DDR3 so a DDR4 DIMM will not fit on a DDR3 DIMM slot

social slot Anyway, I'm interested what is the limit RAM of one SODIMM DDR4 slot of that particular laptop model (what specifics except a processor are