DIMMs are the newer tech.
Answering "What are four types of SO-DIMMs used in a notebook?"
While 184-pin DIMMs and 168-pin DIMMs are approximately the same size, 184-pin DIMMs have only one notch within the row of pins
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Types of DIMMs are DDR3 and DDR2 that have 240 pins, DDR DIMMs with 184 pins and SDRAM DIMMs with 168 pins.
Yes, you can install the four DIMMs of different sizes on the motherboard. However, dual channeling will only be enabled for the pairs of DIMMs that match in size and specifications. The unmatched DIMMs will operate in single-channel mode, which may reduce overall memory performance compared to a fully matched dual-channel configuration. To maximize dual-channel benefits, it's best to use pairs of identical DIMMs.
DDR SDRAM for laptops come ineither 200-pin SO-DIMMs or 172-pin micro-DIMMs
ECC
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the system board receives important information from dimms regarding the ram configuration during?
If you install DIMMS in all four slots that don't match, the memory will still work, just not at top performance.
Some systems use dual memory channels to access ram, if you dont have a pair of memory sticks, it cant work in dual mode, thus not allowing the system to boot. You can buy special DIMM plugins that fool the computer into thinking there are a pair of DIMMs. The other issue could be if your using registered DIMMs in with unregistered DIMMs