Maximum memory - per slot or total?

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SO-DIMM uses the same circuitry and microchips as other memory modules, but is made in a smaller form factor to fit devices that do not have Brand New DDR4 260P Laptopnotebook Memory Slot Socket Forward AS0A821-H2SB-7H DDR2DDR3 Laptop SO DIMM to Desktop DIMM Adapter Memory RAM Adapter

joki slot 138 Brand New DDR4 260P Laptopnotebook Memory Slot Socket Forward AS0A821-H2SB-7H DDR2DDR3 Laptop SO DIMM to Desktop DIMM Adapter Memory RAM Adapter It has nothing to do with RAM slots, it just uses a the same connector as old laptop SODIMMS, which is easily available and has the right number